{"title":"Minerali Lavorati","description":null,"products":[{"product_id":"tumbled-moldavite-032ct-tv017","title":"Tumbled Moldavite 0.32ct - TV017","description":"\u003cul\u003e\n\u003cli\u003eWeight: 0.32ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 4.2 x 4.1 x 3.8 mm\u003c\/li\u003e\n\u003cli\u003eNote: The box is included\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58027490050373,"sku":"TV017","price":29.09,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/58175_photoroom-048-20250923-152027_f3a7783e-8217-4cab-92e4-0005d33aefd3.jpg?v=1783988346"},{"product_id":"tumbled-moldavite-046ct-tv015","title":"Tumbled Moldavite 0.46ct - TV015","description":"\u003cul\u003e\n\u003cli\u003eWeight: 0.46ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 6.4 x 5.8 x 2.2 mm\u003c\/li\u003e\n\u003cli\u003eNote: The box is included\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58027490115909,"sku":"TV015","price":29.09,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/58169_photoroom-043-20250923-152027_f1753630-7069-49ba-9b6b-e255b3a9bd72.jpg?v=1783988344"},{"product_id":"tumbled-moldavite-136ct-tv001","title":"Tumbled Moldavite 1.36ct - TV001","description":"\u003cul\u003e\n\u003cli\u003eWeight: 1.36ct\u003c\/li\u003e\n\u003cli\u003eSize: 7 x 6 x 4 mm\u003c\/li\u003e\n\u003cli\u003eNote: The box is included\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58027490312517,"sku":"TV001","price":38.14,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/57803_tumbled-moldavite-1-36ct_498db7a4-a0fb-48fe-a711-96a2fa372309.jpg?v=1783988342"},{"product_id":"tumbled-moldavite-133ct-tv007","title":"Tumbled Moldavite 1.33ct - TV007","description":"\u003cul\u003e\n\u003cli\u003eWeight: 1.33ct\u003c\/li\u003e\n\u003cli\u003eSize: 8 x 8 x 3 mm\u003c\/li\u003e\n\u003cli\u003eNote: The box is included\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58027490410821,"sku":"TV007","price":43.96,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/58145_photoroom-019-20250923-152027_98888c7f-d206-4f26-8ad6-379fb27f1363.jpg?v=1783988341"},{"product_id":"tumbled-moldavite-187ct-tv010","title":"Tumbled Moldavite 1.87ct - TV010","description":"\u003cul\u003e\n\u003cli\u003eWeight: 1.87ct\u003c\/li\u003e\n\u003cli\u003eSize: 5.8 x 5.8 x 5.4 mm\u003c\/li\u003e\n\u003cli\u003eNote: The box is included\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58027490640197,"sku":"TV010","price":57.52,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/58154_photoroom-028-20250923-152027_2d50d7eb-b22b-4a77-84cc-ae731f6a08ac.jpg?v=1783988336"},{"product_id":"tumbled-moldavite-165ct-tv005","title":"Tumbled Moldavite 1.65ct - TV005","description":"\u003cul\u003e\n\u003cli\u003eWeight: 1.65ct\u003c\/li\u003e\n\u003cli\u003eSize: 8 x 6 x 4.5 mm\u003c\/li\u003e\n\u003cli\u003eNote: The box is included\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58027490935109,"sku":"TV005","price":44.6,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/58139_photoroom-014-20250923-152027_667be196-bacb-4fdc-b4ca-d4da2043a74d.jpg?v=1783988337"},{"product_id":"bracelet-made-of-tumbled-genuine-amber-dark-random-piece-nj012","title":"Bracelet made of tumbled genuine Amber \/ dark – random piece - N\/J012","description":"\u003cul\u003e\n\u003cli\u003eLocation: Latvia (Baltic Sea)\u003c\/li\u003e\n\u003cli\u003eWeight: 12.3g\u003c\/li\u003e\n\u003cli\u003eBracelet Diameter: 17cm\u003c\/li\u003e\n\u003cli\u003eSize of individual Amber beads: 1.1cm\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58027510268229,"sku":"N\/J012","price":25.2,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/66381_photoroom-20260106-154204_f98663c1-c3b0-4621-8e21-80fbae8f5077.jpg?v=1783988190"},{"product_id":"bracelet-made-of-tumbled-genuine-amber-light-random-piece-nj002","title":"Bracelet made of tumbled genuine Amber \/ light – random piece - N\/J002","description":"\u003cul\u003e\n\u003cli\u003eLocation: Latvia (Baltic Sea)\u003c\/li\u003e\n\u003cli\u003eWeight: 6.8g\u003c\/li\u003e\n\u003cli\u003eBracelet Diameter: 6cm\u003c\/li\u003e\n\u003cli\u003eSize of individual Amber beads: 0.8cm\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58027510333765,"sku":"N\/J002","price":18.1,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/50843-1_photoroom-003-20250715-175036_ad34a5d3-2848-4e3b-b234-35010681c128.jpg?v=1783988190"},{"product_id":"bracelet-made-of-tumbled-genuine-amber-mix-random-piece-nj014","title":"Bracelet made of tumbled genuine Amber \/ mix – random piece - N\/J014","description":"\u003cul\u003e\n\u003cli\u003eLocation: Latvia (Baltic Sea)\u003c\/li\u003e\n\u003cli\u003eWeight: 8.6g\u003c\/li\u003e\n\u003cli\u003eBracelet Diameter: 17cm\u003c\/li\u003e\n\u003cli\u003eSize of individual Amber beads: 1cm\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58027510825285,"sku":"N\/J014","price":25.2,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/66387_photoroom-20260106-154341_90726d15-20eb-44d8-9fdf-4d90b4f5dbe4.jpg?v=1783988190"},{"product_id":"czech-garnet-necklace-45-cm-tumbled-beads-nah56","title":"Czech garnet necklace 45 cm - tumbled beads - NAH56","description":"\u003cul\u003e\n\u003cli\u003eClasp: Gold-plated Sterling Silver (Ag 925)\u003c\/li\u003e\n\u003cli\u003eWeight: 14.8 g\u003c\/li\u003e\n\u003cli\u003eLength: 45 cm\u003c\/li\u003e\n\u003cli\u003eIndividual bead size: approximately 4 mm\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58027512889669,"sku":"NAH56","price":937.22,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/76161_czech-garnet-necklace-45-cm---tumbled-beads_dbaaee39-c0bd-49c6-b1a2-d41acce40a9b.jpg?v=1783988171"},{"product_id":"czech-garnet-necklace-44cm-tumbled-beads-nah55","title":"Czech garnet necklace 44cm - tumbled beads - NAH55","description":"\u003cul\u003e\n\u003cli\u003eClasp: Gold-plated Sterling Silver (Ag 925)\u003c\/li\u003e\n\u003cli\u003eWeight: 13.2g\u003c\/li\u003e\n\u003cli\u003eLength: 44 cm\u003c\/li\u003e\n\u003cli\u003eIndividual pearl size: approx. 4 mm\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58027513020741,"sku":"NAH55","price":937.22,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/76158_czech-garnet-necklace-44cm---tumbled-beads_22a335e3-51d7-405b-ab11-e340176f7c9c.jpg?v=1783988170"},{"product_id":"childrens-necklace-made-of-tumbled-genuine-amber-light-random-piece-naj003","title":"Children's Necklace made of genuine tumbled Amber \/ light - random piece - NA\/J003","description":"\u003cul\u003e\n\u003cli\u003eLocation: Latvia (Baltic Sea)\u003c\/li\u003e\n\u003cli\u003eWeight: 6.6g\u003c\/li\u003e\n\u003cli\u003eLength: 31cm\u003c\/li\u003e\n\u003cli\u003eSize of individual Amber beads: 0.6 - 1.2cm\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58027519148357,"sku":"NA\/J003","price":24.56,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/66426_photoroom-003-20260118-184550_cda5c8d2-8a4c-439e-af34-96be559a6a49.jpg?v=1783988080"},{"product_id":"childrens-necklace-made-of-tumbled-genuine-amber-mix-random-piece-naj005","title":"Children's Necklace made of tumbled genuine Amber \/ mix – random piece - NA\/J005","description":"\u003cul\u003e\n\u003cli\u003eLocation: Latvia (Baltic Sea)\u003c\/li\u003e\n\u003cli\u003eWeight: 6.8g\u003c\/li\u003e\n\u003cli\u003eLength: 30cm\u003c\/li\u003e\n\u003cli\u003eSize of individual Amber beads: 0.8cm\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58027519213893,"sku":"NA\/J005","price":24.56,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/66432_photoroom-009-20260118-184550_d6514eb1-f573-4dda-8e48-f1ed50011a1a.jpg?v=1783988078"},{"product_id":"childrens-necklace-made-of-tumbled-genuine-amber-mix-random-piece-naj004","title":"Children's necklace of genuine tumbled Amber \/ mix - random piece - NA\/J004","description":"\u003cul\u003e\n\u003cli\u003eLocation: Latvia (Baltic Sea)\u003c\/li\u003e\n\u003cli\u003eWeight: 5g\u003c\/li\u003e\n\u003cli\u003eLength: 31cm\u003c\/li\u003e\n\u003cli\u003eSize of individual Amber beads: 0.6cm\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58027519279429,"sku":"NA\/J004","price":24.56,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/66429_photoroom-006-20260118-184550_85f21957-77f8-4cdd-a69c-97a293230e03.jpg?v=1783988077"},{"product_id":"precious-opal-cabochon-dubniky-slovakia-dopk03","title":"Precious opal – Cabochon – Dubniky, Slovakia - DOPK03","description":"\u003cul\u003e\n\u003cli\u003eLocation: Dubniky, Slovakia\u003c\/li\u003e\n\u003cli\u003eWeight: 0.6g = 3.2ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 1.4 x 0.8 x 0.4 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003ePrecious Opals from Dubniky in Slovakia are considered one of the rarest and most beautiful gemstones in the world. This exceptional stone was formed millions of years ago during post-volcanic activity, when the specific chemical and physical conditions necessary for its formation were met in a volcano. Even the slightest change in these conditions could have prevented the formation of such a rare gemstone. Dubniky Opals stand out for their colour, where light passing through the specific microstructure of the stone creates a breathtaking optical phenomenon, which the human eye perceives as moving colour rays. The body of the stone is usually white or translucent, which further accentuates its colour play.\nThe history of Opal mining in Dubnik dates back to the 16th century, when Emperor Rudolf II issued a permit for their search. Mining became so important that interest in Opals skyrocketed and the precious stones were sought after by European nobility and rulers. Among the famous personalities who owned jewellery with Opals from Dubnica were Maria Theresa, Napoleon Bonaparte, King Louis XVIII, Empress Elisabeth of Bavaria (Sissi) and Queen Victoria. The historical significance of these gems is evidenced by the price that the Opals achieved - the value often exceeded the price of 100 grams of pure Gold for 1 carat of Opal. The British Royal Family, for example, paid the equivalent of seven million euros for a single Opal.\nThe heyday of Opal mining in Dubnik occurred between 1830 and 1896. Although Opals were discovered in Australia in the mid-19th century, Dubnik Opals retained their prestige and remained the most sought-after Opals in the world. Their uniqueness was heightened after the tragedy of 1950, when a valuable collection of more than 366,000 Opals was destroyed in a museum fire, further adding to their rarity.\nNowadays, deep mining is no longer taking place in Dubnik, but individuals continue to uncover rocks and search for Opals by hand. These stones are still highly valued by collectors and jewellers for their rarity and unique beauty. Despite its high cost, the Dubnica Opal retains its status as an exceptional investment, and its value continues to rise due to limited natural reserves and increasing demand.\nPrecious Opals are distinguished from common synthetic imitations by their long history and origin from Exclusive localities such as Dubnik. While synthetic Opals can lose their colour and quality, genuine Opals from Dubnik are known for their stable and enduring beauty.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028008276293,"sku":"DOPK03","price":1583.59,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/25907-1_precious-opal---cabochon---dubniky--slovakia_86de7f64-4c5b-4609-b5f4-18de6191f78f.jpg?v=1783985729"},{"product_id":"australian-opal-113ct-cabochon-andamooka-australia-ao009","title":"Australian Opal 11.3ct – Cabochon – Andamooka, Australia - AO009","description":"\u003cul\u003e\n\u003cli\u003eLocation: Andamooka, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 2.2g = 11.3ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 2.1 x 1.3 x 0.5 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralian opal is renowned worldwide as the most important source of high-quality opals. The quality of Australian opals is primarily due to their intense and pure play of color. Thanks to specific formation conditions, they often display vibrant and highly contrasting hues. This diversity is reflected in the numerous varieties of opals offered by Australia: from black and boulder opals to crystal, white, and matrix opals. Australian opals are significantly more durable and stable than many opals from other locations. Their lower natural water content increases resistance to changes in temperature and humidity, reducing the risk of cracking or drying out and making them ideal for everyday use in jewelry. Formation Australian opals generally form in sedimentary rocks such as sandstones and clays found in vast basins, for example, the Great Artesian Basin, an enormous underground water system that extends over much of the Australian interior. Silica-rich water gradually penetrates small cracks or pores in the rock. When this water evaporates or drains away, thin layers of silica remain in the cavities and can slowly transform into opal. Microscopic spheres of silicon dioxide (silica) play a fundamental role: they arrange themselves in a regular three-dimensional structure similar to a crystal. This configuration creates the characteristic \"play of color,\" the iridescent effect visible in opal when light hits it. The color and intensity of this effect depend on the size and arrangement of these spheres. Deposits Andamooka is a small mining town in South Australia located approximately 600 kilometers north of Adelaide. It lies near the salt lake Lake Torrens, in a landscape characterized by an arid climate and harsh conditions. However, in the 1930s, rich opal veins were discovered here, making Andamooka one of Australia's oldest opal mining fields. History Although Andamooka is not as famous as Coober Pedy or Lightning Ridge, opal mining here has a long tradition. Many mines are still family-run and use manual labor or small machinery. In the past, Andamooka, like other Australian mining fields, attracted adventurers seeking precious opal veins and the chance to make a fortune under extreme conditions. Types of Australian Opal Black Opal – the rarest and most valuable variety, especially famous for the Lightning Ridge deposit in New South Wales. It features a dark base (black, grey, or dark blue) that enhances the play of color. Black opals often show the most intense color spectrum, including red, green, blue, and purple. Boulder Opal – primarily mined in Queensland. It forms when opal fills thin veins in iron-rich sandstones or other host rocks. This variety often retains part of the original rock, creating a contrasting base. Boulder opals can have darker tones and thus display a lively play of color similar to that of black opals. Crystal Opal – characterized by a transparent or translucent base. In its rough state, it can appear almost colorless, but the iridescence becomes evident through a crystalline or milky base. Crystal Opals are found throughout Australia, with larger quantities coming from Coober Pedy. White Opal (Light Opal) – this variety has a white or milky white base. It can display brilliant colors as much as black opals, but the light background tends to attenuate the visual contrast, making the effect less intense. White opals are particularly common in Coober Pedy and generally more accessible than black or boulder opals. Matrix Opal – a particular variety where opal is embedded in a porous rock, such as sandstone or ironstone. After impregnation treatments, the colors can become much more intense as the dark substrate accentuates the opal's play of color. Andamooka is especially famous for these matrix opals, called Andamooka Matrix, which after treatment can resemble rare black opals from other locations. Value Andamooka opals are particularly valued for their relatively affordable prices and rich color patterns. However, high-quality specimens can reach high values, especially those that display an intense play of color or particularly spectacular patterns, such as the harlequin pattern.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028008440133,"sku":"AO009","price":73.04,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/33251-5_photoroom-025-20250319-094040_72f70696-c8ed-4ac3-b655-55c918bfdb05.jpg?v=1783985730"},{"product_id":"ethiopian-smoky-black-opal-cabochon-welo-ethiopia-okc002","title":"Ethiopian Smoky Black Opal – Cabochon – Welo, Ethiopia - OKC002","description":"\u003cul\u003e\n\u003cli\u003eLocation: Welo, Ethiopia\u003c\/li\u003e\n\u003cli\u003eWeight: 3g = 15.3ct\u003c\/li\u003e\n\u003cli\u003eSize: 2.5 x 1.6 x 0.8 cm\u003c\/li\u003e\n\u003cli\u003eNote: These natural precious Opals have undergone smoke treatment, which gave them this attractive dark appearance that further enhances their play of color.\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eCabochons cut from Ethiopian opals are particularly valued in the jewelry industry because this type of cut enhances the stone's internal opalescent effects and contributes to greater overall stability.\nA cabochon cut has a domed and rounded top without facets, while the bottom is usually flat or slightly concave. This shape allows light to spread across the gently curved surface from multiple angles, effectively enhancing the opal's iridescent play of color and distributing it evenly. At the same time, the smooth, rounded edges protect the stone from mechanical damage, which is particularly important for opals due to their lower hardness. For hydrophane opals, this cut also offers a practical advantage—it helps to reduce internal stresses in the stone, lowering the risk of fracture when the stone absorbs water.\nEthiopian cabochons display a wide range of colors—from light, milky white, through yellow and orange tones, to intense red and green flashes. Many stones also show rare blue or purple plays of color. Thanks to the cabochon shape, these colors flow smoothly over the domed surface.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028008538437,"sku":"OKC002","price":1408.43,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/6513_ethiopian-smoky-black-opal---cabochon---welo--ethiopia_bb667351-7b4b-4fcf-b7df-3d4af28dfa33.jpg?v=1783985730"},{"product_id":"fire-opal-cabochon-queretaro-mexico-ohk02","title":"Fire Opal – Cabochon – Queretaro, Mexico - OHK02","description":"\u003cul\u003e\n\u003cli\u003eLocation: Queretaro, Mexico\u003c\/li\u003e\n\u003cli\u003eWeight: 4.3g\u003c\/li\u003e\n\u003cli\u003eDimensions: 2.4 x 1.4 x 0.9 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFire opals, primarily from Mexico, are a particular variety of mineral known for their vibrant colors in shades of red, orange, yellow, and sometimes green. These colors are caused by the presence of iron in the opal's mineral structure. This gemstone is an amorphous silica with a variable water content ranging between 3 and 10% by weight, rarely up to 21%. Mexico is one of the main sources of fire opals, especially due to the mines in the Querétaro area, discovered in 1835 and still productive today. In this region, opals are extracted from volcanic rocks. Extraction takes place both on the surface and in deeper layers, allowing for high-quality crystals to be obtained. In addition to Querétaro, important deposits are found in the states of Hidalgo, Guerrero, Michoacán, Jalisco, Chihuahua, and San Luis Potosí. Smaller deposits are also present in other nations such as the United States (Oregon), Guatemala, Australia, and Canada. Many fire opals display an effect called \"opalescence,\" which is a play of colors created by the dispersion of light within the gemstone. History and Culture Fire opals have a long history in Mexico and were highly valued by pre-Columbian civilizations such as the Aztecs and Mayans. These cultures considered opals sacred stones and used them in rituals and jewelry. Even today, fire opals are highly sought after and are often used in luxury jewelry. Uses Fire opals are very popular in the jewelry industry due to their beautiful colors and optical effects. They are often set in rings, earrings, necklaces, and other ornaments. Due to their beauty and rarity, they are also appreciated by collectors. Care and Maintenance Fire opals are sensitive to changes in temperature and humidity, which can affect their stability and appearance. It is advisable to avoid sudden temperature changes, not expose opals to excessive humidity or dryness, and clean them with a soft cloth, avoiding chemicals that could damage their surface.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028008669509,"sku":"OHK02","price":1615.91,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/21283_photoroom-003-20240914-190729_d4b835f1-d6be-4f09-948f-f18266b349f4.jpg?v=1783985719"},{"product_id":"indonesian-opal-88ct-cabochon-indonesia-io016","title":"Indonesian Opal 8.8ct – Cabochon – Indonesia - IO016","description":"\u003cul\u003e\n\u003cli\u003eLocation: Indonesia\u003c\/li\u003e\n\u003cli\u003eWeight: 1.7g = 8.8ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 2.4 x 1.5 x 0.2 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIndonesian opals are primarily found on the islands of Java and Borneo, with smaller deposits also occurring in Sumatra. Compared to the renowned Australian mining areas, these stones are less widespread. They are mostly of volcanic origin, formed where silicate-rich solutions are deposited in rock fissures in regions of intense volcanic activity.\nTheir colors can range from milky white or grayish tones to dark, sometimes almost black, shades. Under certain lighting conditions, some specimens display a subtle iridescent play of colors. So-called \"wood opals,\" which form when ancient wood is permeated and fossilized, are also quite common. These often preserve visible organic patterns from the original material.\nOpal mining in Indonesia is not as extensive as in some other countries, which partly explains the lower global awareness of these stones. Extraction is frequently done by hand, with minimal mechanization, and many specimens are subsequently cut and polished.\nIndonesian opals are valued mainly for their exotic origin. They are rarely exported in large quantities, which makes them a rare and sought-after addition to collectors' portfolios.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028009161029,"sku":"IO016","price":96.96,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/38471-8_photoroom-008-20250319-095539_44198255-6d8d-4c5c-83c3-00b749390738.jpg?v=1783985725"},{"product_id":"australian-black-opal-03ct-cabochon-lightning-ridge-australia-ao016","title":"Australian Black Opal 0.3ct – Cabochon – Lightning Ridge, Australia - AO016","description":"\u003cul\u003e\n\u003cli\u003eLocation: Lightning Ridge, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 0.06g = 0.3ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 0.53 x 0.3 x 0.22 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralian opal is renowned worldwide as the most important source of high-quality opals. The quality of Australian opals is primarily due to their intense and pure play-of-color. Thanks to specific formation conditions, they often display vivid and contrasting hues. This variety is reflected in the numerous types of opal found in Australia — from black and boulder opals to crystal, white, and matrix opals. Australian opals are notably more durable and stable than many opals from other locations. Their naturally lower water content increases their resistance to temperature fluctuations and humidity changes, reducing the risk of cracking or drying out, making them ideal for everyday use in jewelry. Formation Australian opals typically form in sedimentary rocks such as sandstones and clays, found in large geological basins (e.g., the Great Artesian Basin, a vast underground water system covering much of Australia's interior). Silica-rich water gradually penetrates small cracks and pores in the rock. As the water evaporates or drains, thin layers of silica remain in the cavities and can transform into opal. Microscopic spheres of silicon dioxide (silica) play a fundamental role: they arrange themselves in a regular three-dimensional, crystal-like structure. This arrangement creates the characteristic \"play-of-color,\" the iridescent effect visible when light strikes the opal. The color and intensity of this effect depend on the size and arrangement of the spheres. Deposits Lightning Ridge is a legendary opal field located in the Australian state of New South Wales, approximately 770 kilometers northwest of Sydney. This area is particularly famous for the so-called black opals, considered among the rarest and most valuable varieties in the world. History Mining activity in this area dates back to the late 19th century, but the true boom began in the early 20th century when explorers discovered opal-bearing layers with striking color effects. The name \"Lightning Ridge\" is linked to a legend that a shepherd and his flock died on a hill during a storm, struck by lightning. Reality or legend, this story gave the place a suggestive and memorable name. Types of Australian Opals Black Opal The rarest and most valuable type of opal, most famous for the deposits around Lightning Ridge. It possesses a dark body tone (black, gray, or dark blue) that intensifies the play-of-color. Black opals often show the most intense color range, including red, green, blue, and purple. Boulder Opal Mined primarily in northeastern Queensland. It forms when opal fills thin veins in iron-rich sandstone or other host rocks. This variety often retains part of the original rock, creating a contrasting base. Boulder opals can have dark body tones and display vivid play-of-color similar to black opals. Crystal Opal Characterized by a translucent or transparent body tone. Sometimes in its rough state, it may show little color, but once cut, it reveals prismatic flashes through a transparent or milky background. Crystal opals are found throughout Australia, with significant quantities coming from locations such as Coober Pedy. White Opal (Light Opal) This variety possesses a white or milky-white body tone. It can display colors as vibrant as those of black opals, but they generally appear less intense because the light background reduces visual contrast. White opals are particularly common in Coober Pedy and are more accessible than black or boulder opals. Matrix Opal A special variety where opal is found within porous rocks such as sandstone or ironstone. After impregnation treatments, the colors can become much more intense due to the contrast created by the dark matrix. Andamooka is famous for these matrix opals, called Andamooka Matrix, which after treatment can resemble the rare black opals from other areas. Value The prices of black opals from Lightning Ridge can reach astronomical figures, depending on their size, saturation, variety of colors, pattern arrangement, and purity of the stone. The rarest specimens, especially those with a predominance of red or many bright hues, are considered among the most expensive gemstones in the world.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028009193797,"sku":"AO016","price":61.41,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/41537_photoroom-001-20250402-005902_e6d4dd0e-0963-4184-92fa-f5e2876cd1f6.jpg?v=1783985719"},{"product_id":"australian-black-opal-055ct-cabochon-lightning-ridge-australia-ao025","title":"Australian black Opal 0.55ct – Cabochon – Lightning Ridge, Australia - AO025","description":"\u003cul\u003e\n\u003cli\u003eLocation: Lightning Ridge, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 0.11g = 0.55ct\u003c\/li\u003e\n\u003cli\u003eSize: 0.71 x 0.4 x 0.23 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralian Opal is renowned worldwide as the most important source of high-quality opals. The quality of Australian opals is primarily due to their intense and pure play-of-color. Thanks to specific formation conditions, they often display vivid and contrasting hues. This variety is reflected in the many types of opal found in Australia — from black and boulder opals to crystal, white, and matrix opals. Australian opals are significantly more durable and stable than many opals from other locations. Their naturally lower water content increases resistance to temperature fluctuations and humidity changes, reducing the risk of cracking or drying out and making them ideal for daily use in jewelry. Formation Australian opals typically form in sedimentary rocks such as sandstone and clay, found in large geological basins (e.g., the Great Artesian Basin, a vast underground water system covering much of Australia's interior). Silica-rich water gradually penetrates small cracks and pores in the rock. As the water evaporates or drains away, thin layers of silica remain in the cavities and can transform into opal. Microscopic spheres of silicon dioxide (silica) play a fundamental role: they arrange themselves in a regular three-dimensional, crystal-like structure. This arrangement creates the characteristic \"play-of-color,\" the iridescent effect visible when light strikes the opal. The color and intensity of this effect depend on the size and arrangement of the spheres. Deposits Lightning Ridge is a legendary opal field located in the Australian state of New South Wales, approximately 770 kilometers northwest of Sydney. This area is particularly famous for its so-called black opals, considered among the rarest and most valuable varieties in the world. History Mining activity in this area dates back to the late 19th century, but the real boom began in the early 20th century when explorers discovered opal-bearing layers with astonishing color effects. The name \"Lightning Ridge\" is linked to a legend that a shepherd and his flock died on a ridge during a storm, struck by lightning. Reality or legend, this story gave the place a suggestive and memorable name. Types of Australian Opals Black Opal The rarest and most valuable type of opal, famous especially for the deposits around Lightning Ridge. It has a dark body tone (black, grey, or dark blue) which intensifies the play-of-color. Black opals often display the most intense color range, including red, green, blue, and purple. Boulder Opal Mined primarily in northeastern Queensland. It forms when opal fills thin veins present in iron-rich sandstone or other host rocks. This variety often retains part of the original rock, creating a contrasting base. Boulder opals can have dark tones and display vibrant play-of-color similar to black opals. Crystal Opal Characterized by a translucent or transparent body tone. Sometimes in its rough state, it may show little color, but once cut, it reveals prismatic flashes through a transparent or milky background. Crystal opals are found throughout Australia, with significant quantities coming from locations such as Coober Pedy. White Opal (Light Opal) This variety has a white or milky-white body tone. It can display colors as vibrant as those of black opals, but they generally appear less intense because the light background reduces visual contrast. White opals are particularly common in Coober Pedy and are more accessible than black or boulder opals. Matrix Opal A special variety where opal is found within porous rocks such as sandstone or ironstone. After impregnation treatments, the colors can become much more intense due to the contrast created by the dark matrix. Andamooka is famous for these matrix opals, called Andamooka Matrix, which after treatment can resemble the rare black opals from other areas. Value The prices of black opals from Lightning Ridge can reach astronomical figures, depending on their size, saturation, variety of colors, pattern arrangement, and purity of the stone. The rarest specimens, especially those with a predominance of red or many bright hues, are considered among the most expensive gemstones in the world.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028009390405,"sku":"AO025","price":180.98,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/41564_photoroom-010-20250402-202523_bb76430f-e912-4b21-a312-4912986c3c96.jpg?v=1783985714"},{"product_id":"australian-black-opal-05ct-cabochon-lightning-ridge-australia-ao018","title":"Australian Black Opal 0.5ct – Cabochon – Lightning Ridge, Australia - AO018","description":"\u003cul\u003e\n\u003cli\u003eLocation: Lightning Ridge, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 0.1g = 0.5ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 0.6 x 0.34 x 0.27 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralian Opal is renowned worldwide as the most important source of high-quality opals. The quality of Australian opals is mainly due to their intense and pure play-of-color. Thanks to specific formation conditions, they often display vivid and contrasting hues. This variety is reflected in the numerous types of opal found in Australia — from black and boulder opals to crystal, white, and matrix opals. Australian opals are notably more durable and stable than many opals from other locations. Their naturally lower water content increases resistance to temperature fluctuations and humidity changes, reducing the risk of cracking or drying out and making them ideal for everyday use in jewelry. Formation Australian opals typically form in sedimentary rocks such as sandstones and clays, found in large geological basins (e.g., the Great Artesian Basin, a vast underground water system covering much of Australia's interior). Silica-rich water gradually penetrates small cracks and pores in the rock. As the water evaporates or drains away, thin layers of silica remain in the cavities and can transform into opal. Microscopic spheres of silicon dioxide (silica) play a fundamental role: they arrange themselves in a regular three-dimensional crystal-like structure. This arrangement creates the characteristic \"play-of-color,\" the iridescent effect visible when light strikes the opal. The color and intensity of this effect depend on the size and arrangement of the spheres. Deposits Lightning Ridge is a legendary opal field located in the Australian state of New South Wales, approximately 770 kilometers northwest of Sydney. This area is particularly famous for the so-called black opals, considered among the rarest and most valuable varieties in the world. History Mining activity in this area dates back to the late 19th century, but the real boom began in the early 20th century when explorers discovered layers containing opals with surprising color effects. The name \"Lightning Ridge\" is linked to a legend that a shepherd and his flock died on a hill during a storm, struck by lightning. Reality or legend, this story gave the place a suggestive and memorable name. Types of Australian Opals Black Opal The rarest and most valuable type of opal, famous mainly for the deposits around Lightning Ridge. It has a dark base (black, gray, or dark blue) that intensifies the play-of-color. Black opals often show the most intense color range, including red, green, blue, and purple. Boulder Opal Primarily extracted in northeastern Queensland. It forms when opal fills thin veins present in iron-rich sandstones or other host rocks. This variety often retains part of the original rock, creating a contrasting base. Boulder opals can have dark hues and display vivid play-of-color similar to black opals. Crystal Opal Characterized by a translucent or transparent base. Sometimes in its raw state, it may show few colors, but once cut, it reveals prismatic flashes through a transparent or milky background. Crystal opals are found throughout Australia, with significant quantities coming from locations such as Coober Pedy. White Opal (Light Opal) This variety has a white or milky-white base. It can display colors as vibrant as those of black opals, but they generally appear less intense because the light background reduces visual contrast. White opals are particularly common in Coober Pedy and are more accessible than black or boulder opals. Matrix Opal A special variety where opal is found within porous rocks such as sandstone or ironstone. After impregnation treatments, the colors can become much more intense due to the contrast created by the dark matrix. Andamooka is famous for these matrix opals, called Andamooka Matrix, which after treatment can resemble the rare black opals from other areas. Value The prices of black opals from Lightning Ridge can reach astronomical figures, depending on the size, saturation, variety of colors, pattern arrangement, and purity of the stone. The rarest specimens, especially those with a predominance of red or with many bright hues, are considered among the most expensive gemstones in the world.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028009521477,"sku":"AO018","price":87.26,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/41543_photoroom-004-20250402-175359_77144b3a-0965-430a-b5f4-116bab16387c.jpg?v=1783985708"},{"product_id":"australian-opal-025ct-cabochon-lightning-ridge-australia-ao027","title":"Australian Opal 0.25ct – Cabochon – Lightning Ridge, Australia - AO027","description":"\u003cul\u003e\n\u003cli\u003eLocation: Lightning Ridge, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 0.05g = 0.25ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 0.51 x 0.31 x 0.29 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralian opal is renowned worldwide as the most important source of high-quality opals. The quality of Australian opals is primarily due to their intense and pure play of color. Thanks to specific formation conditions, they often display vivid and contrasting hues. This variety is reflected in the numerous types of opal found in Australia — from black and boulder opals to crystal, white, and matrix opals. Australian opals are notably more durable and stable than many opals from other locations. Their naturally lower water content increases resistance to temperature fluctuations and humidity changes, reducing the risk of cracking or drying out and making them ideal for everyday use in jewelry. Formation Australian opals typically form in sedimentary rocks such as sandstones and clays, found in large geological basins (e.g., the Great Artesian Basin, a vast underground water system covering much of Australia's interior). Silica-rich water gradually seeps into tiny cracks and pores in the rock. As the water evaporates or drains away, thin layers of silica remain in the cavities and can transform into opal. Microscopic spheres of silicon dioxide (silica) play a fundamental role: they arrange themselves in a regular three-dimensional crystal-like structure. This arrangement creates the characteristic \"play of color,\" the iridescent effect visible when light hits the opal. The color and intensity of this effect depend on the size and arrangement of the spheres. Deposits Lightning Ridge is a legendary opal field located in the Australian state of New South Wales, approximately 770 kilometers northwest of Sydney. This area is particularly famous for so-called black opals, considered among the rarest and most valuable varieties in the world. History Mining activity in this area dates back to the late 19th century, but the real boom began in the early 20th century when explorers discovered opal-bearing layers with astonishing color effects. The name \"Lightning Ridge\" is linked to a legend that a shepherd and his flock died on a hill during a thunderstorm, struck by lightning. Reality or legend, this story has given the place a evocative and memorable name. Types of Australian Opals Black Opal The rarest and most valuable type of opal, famous especially for the deposits around Lightning Ridge. It has a dark base (black, gray, or dark blue) that intensifies the play of color. Black opals often show the most intense color range, including red, green, blue, and purple. Boulder Opal Primarily mined in northeastern Queensland. It forms when opal fills thin veins present in iron-rich sandstones or other host rocks. This variety often retains part of the original rock, creating a contrasting base. Boulder opals can have dark hues and display vibrant plays of color similar to black opals. Crystal Opal Characterized by a translucent or transparent base. Sometimes in its rough state, it may show few colors, but once cut, it reveals prismatic flashes through a clear or milky background. Crystal opals are found throughout Australia, with significant quantities coming from locations such as Coober Pedy. White Opal (Light Opal) This variety has a white or milky-white base. It can display colors as vibrant as black opals, but they generally appear less intense because the light background reduces visual contrast. White opals are particularly common in Coober Pedy and are more accessible than black or boulder opals. Matrix Opal A special variety where opal is found within porous rocks such as sandstone or ironstone. After impregnation treatments, the colors can become much more intense due to the contrast created by the dark matrix. Andamooka is famous for these matrix opals, called Andamooka Matrix, which after treatment can resemble the rare black opals from other areas. Value The prices of black opals from Lightning Ridge can reach astronomical figures, depending on the size, saturation, variety of colors, pattern arrangement, and purity of the stone. The rarest specimens, especially those with a predominance of red or with many bright hues, are considered among the most expensive gemstones in the world.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028009652549,"sku":"AO027","price":61.41,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/41570_photoroom-000-20250402-204945_70273193-63f7-422a-b110-42bc75809402.jpg?v=1783985707"},{"product_id":"20-pcs-precious-opal-cabochons-welo-ethiopia-opk131","title":"20 pcs precious opal cabochons - Welo, Ethiopia - OPK131","description":"\u003cul\u003e\n\u003cli\u003eLocation: Welo, Ethiopia\u003c\/li\u003e\n\u003cli\u003eWeight: 11.4ct\u003c\/li\u003e\n\u003cli\u003eSize: approx. 6 mm\u003c\/li\u003e\n\u003cli\u003eNote: Box is included in the package\u003c\/li\u003e\n\u003cli\u003ePrice is for 20 pcs\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eEthiopian Opal Cabochons Ethiopian opal cabochons are among the most popular cuts in jewelry, as the cabochon cut strongly enhances the opalescent effects of the stone while improving its mechanical stability. Thanks to this type of cut, the natural play of color typical of Ethiopian opals is beautifully highlighted. Characteristics of the cabochon cut The cabochon cut is characterized by a smooth, domed upper surface without facets, while the lower part of the stone is flat or slightly concave. This shape allows light to diffuse across the curved surface from many angles, effectively enhancing the iridescent play of colors and evenly distributing the opalescent effects throughout the stone. Stability and protection of the opal The rounded edges of the cabochon protect the opal from mechanical damage, which is particularly important given its relatively low hardness. In the case of hydrophane Ethiopian opals, this shape also offers a practical advantage: it reduces internal stresses and lowers the risk of cracks during water absorption. Color variability of Ethiopian opals Ethiopian opal cabochons display a wide range of colors, from light milky white to yellow and orange hues, with vibrant red and green flashes. Some specimens also exhibit rare blue or purple color play, which flows harmoniously across the domed surface thanks to the cabochon cut.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028009750853,"sku":"OPK131","price":225.59,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/70639_20-pcs-precious-opal-cabochons---welo--ethiopia_be70148b-2007-41a2-ba7b-6a2b92675342.jpg?v=1783985726"},{"product_id":"australian-opal-02ct-cabochon-lightning-ridge-australia-ao028","title":"Australian Opal 0.2ct - Cabochon - Lightning Ridge, Australia - AO028","description":"\u003cul\u003e\n\u003cli\u003eLocation: Lightning Ridge, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 0.04g = 0.2ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 0.5 x 0.33 x 0.2 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralian Opal is renowned worldwide as the most important source of high-quality opals. The quality of Australian opals is primarily due to their intense and pure play of color. Thanks to specific formation conditions, they often display vivid and contrasting hues. This variety is reflected in the numerous types of opal found in Australia — from black and boulder opals to crystal, white, and matrix opals. Australian opals are significantly more durable and stable than many opals from other locations. Their naturally lower water content increases resistance to temperature fluctuations and humidity changes, reducing the risk of cracking or drying out and making them ideal for everyday use in jewelry. Formation Australian opals typically form in sedimentary rocks such as sandstones and clays, found in large geological basins (e.g., the Great Artesian Basin, a vast underground water system covering much of Australia's interior). Silica-rich water gradually seeps into tiny cracks and pores in the rock. As the water evaporates or drains away, thin layers of silica remain in the cavities and can transform into opal. Microscopic spheres of silicon dioxide (silica) play a crucial role: they arrange themselves in a regular three-dimensional crystal-like structure. This arrangement creates the characteristic \"play of color,\" the iridescent effect visible when light strikes the opal. The color and intensity of this effect depend on the size and arrangement of the spheres. Deposits Lightning Ridge is a legendary opal field located in the Australian state of New South Wales, approximately 770 kilometers northwest of Sydney. This area is particularly famous for its so-called black opals, considered among the rarest and most valuable varieties in the world. History Mining activity in this area dates back to the late 19th century, but the real boom began in the early 20th century when explorers discovered opal-bearing layers with astonishing color effects. The name \"Lightning Ridge\" is linked to a legend that a shepherd and his flock died on a hill during a storm, struck by lightning. Reality or legend, this story gave the place a suggestive and memorable name. Types of Australian Opals Black Opal The rarest and most valuable type of opal, famous especially for the deposits around Lightning Ridge. It has a dark body tone (black, grey, or dark blue) which intensifies the play of color. Black opals often show the most intense color range, including red, green, blue, and purple. Boulder Opal Mined primarily in northeastern Queensland. It forms when opal fills thin veins found in iron-rich sandstone or other host rocks. This variety often retains part of the original rock, creating a contrasting base. Boulder opals can have dark tones and display vibrant play of color similar to black opals. Crystal Opal Characterized by a translucent or transparent body tone. Sometimes in its raw state, it may show few colors, but once cut, it reveals prismatic flashes through a clear or milky background. Crystal opals are found throughout Australia, with significant quantities coming from locations such as Coober Pedy. White Opal (Light Opal) This variety has a white or milky-white body tone. It can display colors as vibrant as those of black opals, but they generally appear less intense because the light background reduces visual contrast. White opals are particularly common in Coober Pedy and are more accessible than black or boulder opals. Matrix Opal A special variety where opal is found within porous rocks such as sandstone or ironstone. After impregnation treatments, the colors can become much more intense due to the contrast created by the dark matrix. Andamooka is famous for these matrix opals, called Andamooka Matrix, which after treatment can resemble the rare black opals from other areas. Value The prices of black opals from Lightning Ridge can reach astronomical figures, depending on the size, saturation, variety of colors, pattern arrangement, and purity of the stone. The rarest specimens, especially those with a predominance of red or with many bright hues, are considered among the most expensive gems in the world.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028009816389,"sku":"AO028","price":42.01,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/41573_photoroom-006-20250402-210827_29db50ce-be0d-4fc5-9ebc-974a5d82d990.jpg?v=1783985703"},{"product_id":"australian-opal-138ct-cabochon-andamooka-australia-ao049","title":"Australian Opal 13.8ct – Cabochon – Andamooka, Australia - AO049","description":"\u003cul\u003e\n\u003cli\u003eLocation: Andamooka, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 2.7g = 13.8ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 2.7 x 1.6 x 0.5 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralian opal is renowned worldwide as the most important source of high-quality opals. The quality of Australian opals is primarily due to their intense and pure play of color. Thanks to specific formation conditions, they often display vibrant and highly contrasting hues. This diversity is reflected in the numerous varieties of opals offered by Australia: from black and boulder opals to crystal, white, and matrix opals. Australian opals are notably more durable and stable than many opals from other locations. Their lower natural water content increases resistance to temperature and humidity variations, reducing the risk of cracks or dehydration, and making them ideal for everyday use in jewelry. Formation Australian opals generally form in sedimentary rocks such as sandstones and clays found in enormous basins, for example, the Great Artesian Basin, a vast underground water system that extends over much of the Australian interior. Silica-rich water gradually penetrates small cracks or pores in the rock. When this water evaporates or drains away, thin layers of silica remain in the cavities and can slowly transform into opal. Microscopic spheres of silicon dioxide (silica) play a fundamental role: they arrange themselves in a regular three-dimensional structure similar to a crystal. This configuration creates the characteristic \"play of color,\" the iridescent effect visible in opal when light hits it. The color and intensity of this effect depend on the size and arrangement of these spheres. Deposits Andamooka is a small mining town in South Australia located approximately 600 kilometers north of Adelaide. It lies near the salt lake Lake Torrens, in a landscape characterized by an arid climate and difficult conditions. However, in the 1930s, rich opal veins were discovered here, making Andamooka one of Australia's oldest opal mining fields. History Although Andamooka is not as famous as Coober Pedy or Lightning Ridge, opal mining here has a long tradition. Many mines are still family-run and use manual labor or small machinery. In the past, Andamooka, like other Australian mining fields, attracted adventurers in search of precious opal veins and the chance to make their fortune in extreme conditions. Types of Australian opal Black Opal – the rarest and most valuable variety, especially famous for the Lightning Ridge deposit in New South Wales. It features a dark base (black, gray, or dark blue) that enhances the play of color. Black opals often show the most intense color spectrum, including red, green, blue, and purple. Boulder Opal – mainly extracted in Queensland. It forms when opal fills thin veins in iron-rich sandstones or other host rocks. This variety often retains part of the original rock, creating a contrasting base. Boulder opals can have darker tones and thus display a lively play of color similar to black opals. Crystal Opal – characterized by a transparent or translucent base. In its rough state, it may appear almost colorless, but the iridescence becomes evident through a crystalline or milky base. Crystal opals are found throughout Australia, with larger quantities coming from Coober Pedy. White Opal (Light Opal) – this variety has a white or milky-white base. It can show colors as brilliant as black opals, but the light background tends to attenuate the visual contrast, making the effect less intense. White opals are particularly common in Coober Pedy and generally more accessible than black or boulder opals. Matrix Opal – a particular variety where the opal is embedded in a porous rock, such as sandstone or ironstone. After impregnation treatments, the colors can become much more intense as the dark substrate accentuates the opal's play of color. Andamooka is especially famous for these matrix opals, called Andamooka Matrix, which after treatment can resemble the rare black opals from other locations. Value Andamooka opals are particularly valued for their relatively affordable prices and rich color patterns. However, high-quality specimens can reach high values, especially those showing an intense play of color or particularly spectacular patterns, such as the harlequin pattern.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028009914693,"sku":"AO049","price":96.31,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/43448_australian-opal-13-8ct---cabochon---andamooka--australia_6ac8b187-8da3-424a-9fb1-de9a9bb2f9dc.jpg?v=1783985701"},{"product_id":"20-pcs-precious-opal-cabochons-welo-ethiopia-opk132","title":"20 pcs precious opal cabochons - Welo, Ethiopia - OPK132","description":"\u003cul\u003e\n\u003cli\u003eLocation: Welo, Ethiopia\u003c\/li\u003e\n\u003cli\u003eWeight: 6.4ct\u003c\/li\u003e\n\u003cli\u003eDimensions: approx. 5 mm\u003c\/li\u003e\n\u003cli\u003eNote: Box is included in the package\u003c\/li\u003e\n\u003cli\u003ePrice is for 20 pcs\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eEthiopian Opal Cabochons Ethiopian opal cabochons are among the most popular cut forms in jewelry, as the cabochon cut strongly enhances the opalescent effects of the stone while improving its mechanical stability. Thanks to this type of cut, the natural play of colors typical of Ethiopian opals is beautifully showcased. Characteristics of the cabochon cut The cabochon cut is characterized by a smooth, domed upper surface free of facets, while the bottom of the stone is flat or slightly concave. This shape allows light to diffuse across the curved surface from many angles, effectively enhancing the iridescent play of colors and evenly distributing the opalescent effects throughout the stone. Stability and protection of the opal The rounded edges of the cabochon protect the opal from mechanical damage, which is particularly important given its relatively low hardness. In the case of hydrophane Ethiopian opals, this shape also offers a practical advantage: it reduces internal stresses and decreases the risk of cracks during water absorption. Color variability of Ethiopian opals Ethiopian opal cabochons display a wide range of colors, from light milky white shades to yellow and orange hues, with vivid red and green flashes. Some specimens also show rare blue or purple color play, which flows harmoniously across the domed surface thanks to the cabochon cut.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028010045765,"sku":"OPK132","price":126.04,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/70642_20-pcs-precious-opal-cabochons---welo--ethiopia_7a890bf9-f79a-4ac9-a1c9-9624abe41499.jpg?v=1783985747"},{"product_id":"australian-black-opal-185ct-cabochon-lightning-ridge-australia-ao026","title":"Australian black Opal 1.85ct – Cabochon – Lightning Ridge, Australia - AO026","description":"\u003cul\u003e\n\u003cli\u003eLocation: Lightning Ridge, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 0.37g = 1.85ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 0.93 x 0.69 x 0.4 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralian Opal is renowned worldwide as the most significant source of high-quality opals. The quality of Australian opals is primarily due to their intense and pure play of color. Thanks to specific formation conditions, they often display vivid and contrasting hues. This variety is reflected in the numerous types of opal found in Australia — from black and boulder opals to crystal, white, and matrix opals. Australian opals are notably more durable and stable than many opals from other locations. Their naturally lower water content increases their resistance to temperature fluctuations and humidity changes, reducing the risk of cracking or drying out, making them ideal for everyday use in jewelry. Formation Australian opals typically form in sedimentary rocks like sandstone and clay, found in large geological basins (e.g., the Great Artesian Basin, a vast underground water system covering much of Australia's interior). Siliceous water gradually permeates small cracks and pores in the rock. When the water evaporates or drains away, thin layers of silica remain in the cavities and can transform into opal. Microscopic spheres of silicon dioxide (silica) play a fundamental role: they arrange themselves in a regular three-dimensional, crystal-like structure. This arrangement creates the characteristic \"play of color,\" the iridescent effect visible when light strikes the opal. The color and intensity of this effect depend on the size and arrangement of the spheres. Deposits Lightning Ridge is a legendary opal field located in the Australian state of New South Wales, approximately 770 kilometers northwest of Sydney. This area is particularly famous for its so-called black opals, considered among the rarest and most valuable varieties in the world. History Mining activity in this area dates back to the late 19th century, but the real boom began in the early 20th century when explorers discovered layers containing opals with astonishing color effects. The name \"Lightning Ridge\" is linked to a legend that a shepherd and his flock died on a hill during a storm, struck by lightning. Reality or legend, this story has given the place a suggestive and memorable name. Types of Australian Opals Black Opal The rarest and most valuable type of opal, famous primarily for the deposits around Lightning Ridge. It has a dark base (black, gray, or dark blue) that intensifies the play of color. Black opals often show the most intense color range, including red, green, blue, and violet. Boulder Opal Primarily mined in northeastern Queensland. It forms when opal fills thin veins present in iron-rich sandstones or other host rocks. This variety often retains part of the original rock, creating a contrasting base. Boulder opals can have dark tones and display vibrant play of color similar to black opals. Crystal Opal Characterized by a translucent or transparent base. Sometimes in its rough state, it may show little color, but once cut, it reveals prismatic flashes through a transparent or milky background. Crystal opals are found throughout Australia, with significant quantities coming from locations like Coober Pedy. White Opal (Light Opal) This variety has a white or milky-white base. It can show colors as vivid as those of black opals, but they generally appear less intense because the light background reduces visual contrast. White opals are particularly common in Coober Pedy and are more accessible than black or boulder opals. Matrix Opal A special variety where opal is found within porous rocks such as sandstone or ironstone. After impregnation treatments, the colors can become much more intense due to the contrast created by the dark matrix. Andamooka is famous for these matrix opals, called Andamooka Matrix, which after treatment can resemble the rare black opals from other areas. Value The prices of black opals from Lightning Ridge can reach astronomical figures, depending on the size, saturation, variety of colors, pattern arrangement, and purity of the stone. The rarest specimens, especially those with a predominance of red or with many bright hues, are considered among the most expensive gemstones in the world.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028010144069,"sku":"AO026","price":827.35,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/41567_photoroom-011-20250402-202523_d8c9e99b-ce88-40d6-a558-de998eb0c166.jpg?v=1783985708"},{"product_id":"australian-opal-135ct-cabochon-andamooka-australia-ao005","title":"Australian Opal 13.5ct – Cabochon – Andamooka, Australia - AO005","description":"\u003cul\u003e\n\u003cli\u003eLocation: Andamooka, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 2.7g = 13.5ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 2.4 x 1.6 x 0.5 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralian opal is renowned worldwide as the most significant source of high-quality opals. The quality of Australian opals is primarily due to their intense and pure play of color. Thanks to specific formation conditions, they often display vibrant and strongly contrasting hues. This diversity is reflected in the numerous varieties of opals offered by Australia: from black and boulder opals to crystal, white, and matrix opals. Australian opals are notably more durable and stable than many opals from other locations. Their naturally lower water content increases their resistance to temperature and humidity variations, reducing the risk of cracking or drying out, and making them ideal for everyday use in jewelry. Formation Australian opals generally form in sedimentary rocks such as sandstones and clays found in enormous basins, for example, the Great Artesian Basin, a vast underground water system that spans much of the Australian interior. Silica-rich water gradually penetrates small fissures or pores in the rock. When this water evaporates or drains away, thin layers of silica remain in the cavities and can slowly transform into opal. Microscopic spheres of silicon dioxide (silica) play a fundamental role: they arrange themselves in a regular three-dimensional, crystal-like structure. This configuration creates the characteristic \"play of color,\" the iridescent effect visible in opal when light hits it. The color and intensity of this effect depend on the size and arrangement of these spheres. Deposits Andamooka is a small mining town in South Australia located about 600 kilometers north of Adelaide. It is situated near the salt lake Lake Torrens, in a landscape characterized by an arid climate and harsh conditions. However, in the 1930s, rich opal veins were discovered here, making Andamooka one of Australia's oldest opal mining fields. History Although Andamooka is not as famous as Coober Pedy or Lightning Ridge, opal mining here has a long tradition. Many mines are still family-run and use manual labor or small machinery. In the past, Andamooka, like other Australian mining fields, attracted adventurers seeking precious opal veins and the chance to strike it rich under extreme conditions. Types of Australian opal Black Opal – the rarest and most valuable variety, particularly famous for the Lightning Ridge deposit in New South Wales. It features a dark base (black, gray, or dark blue) that enhances the play of color. Black opals often display the most intense color spectrum, including red, green, blue, and purple. Boulder Opal – mainly extracted in Queensland. It forms when opal fills thin veins in iron-rich sandstones or other host rocks. This variety often retains part of the original rock, creating a contrasting base. Boulder opals can have darker tones and thus display a vibrant play of color similar to black opals. Crystal Opal – characterized by a transparent or translucent base. In its raw state, it may appear almost colorless, but iridescence becomes evident through a crystalline or milky base. Crystal opals are found throughout Australia, with larger quantities coming from Coober Pedy. White Opal (Light Opal) – this variety has a white or milky-white base. It can show colors as brilliant as those of black opals, but the light background tends to soften the visual contrast, making the effect less intense. White opals are particularly common in Coober Pedy and generally more accessible than black or boulder opals. Matrix Opal – a particular variety in which opal is embedded in a porous rock, such as sandstone or ironstone. After impregnation treatments, the colors can become much more intense as the dark substrate accentuates the opal's play of color. Andamooka is especially famous for these matrix opals, called Andamooka Matrix, which after treatment can resemble rare black opals from other locations. Value Andamooka opals are particularly valued for their relatively affordable prices and rich color patterns. However, high-quality specimens can fetch high values, especially those showing an intense play of color or particularly spectacular patterns, such as the harlequin pattern.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028010209605,"sku":"AO005","price":87.91,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/33239-5_photoroom-005-20250319-094040_8f1f1eae-ea97-4510-8851-d2036fe2e909.jpg?v=1783985701"},{"product_id":"australian-opal-139ct-cabochon-andamooka-australia-ao062","title":"Australian Opal 13.9ct – Cabochon – Andamooka, Australia - AO062","description":"\u003cul\u003e\n\u003cli\u003eLocation: Andamooka, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 2.7g = 13.9ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 2.2 x 1.9 x 0.4 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralian Opal is renowned worldwide as the most important source of high-quality opals. The quality of Australian opals is primarily due to their intense and pure play of color. Thanks to specific formation conditions, they often display vibrant and strongly contrasting hues. This diversity is reflected in the numerous varieties of opals offered by Australia: from black and boulder opals to crystal, white, and matrix opals. Australian opals are notably more durable and stable than many opals from other locations. Their lower natural water content increases resistance to temperature and humidity variations, reducing the risk of cracking or drying out and making them ideal for everyday use in jewelry. Formation Australian opals generally form in sedimentary rocks such as sandstones and clays found in enormous basins, for example, the Great Artesian Basin, a vast underground water system extending over much of inland Australia. Silica-rich water gradually seeps into small cracks or pores in the rock. As this water evaporates or drains away, thin layers of silica remain in the cavities and can slowly transform into opal. Microscopic spheres of silicon dioxide (silica) play a fundamental role: they arrange themselves in a regular three-dimensional crystal-like structure. This configuration creates the characteristic \"play of color,\" the iridescent effect visible in opal when light strikes it. The color and intensity of this effect depend on the size and arrangement of these spheres. Deposits Andamooka is a small mining town in South Australia located approximately 600 kilometers north of Adelaide. It lies near the salt lake Lake Torrens, in a landscape characterized by an arid climate and harsh conditions. However, in the 1930s, rich opal veins were discovered here, making Andamooka one of Australia's oldest opal mining fields. History Although Andamooka is not as famous as Coober Pedy or Lightning Ridge, opal mining here has a long tradition. Many mines are still family-run and use manual labor or small machinery. In the past, Andamooka, like other Australian mining fields, attracted adventurers searching for precious opal veins and the chance to make a fortune under extreme conditions. Types of Australian Opal Black Opal – the rarest and most valuable variety, famous especially for the Lightning Ridge deposit in New South Wales. It features a dark body tone (black, grey, or dark blue) that enhances the play of color. Black opals often show the most intense color spectrum, including red, green, blue, and violet. Boulder Opal – mainly extracted in Queensland. It forms when opal fills thin veins in iron-rich sandstones or other host rocks. This variety often retains part of the original rock, creating a contrasting base. Boulder opals can have darker tones and therefore show a vibrant play of color similar to that of black opals. Crystal Opal – characterized by a transparent or translucent base. In its raw state, it can appear almost colorless, but the iridescence becomes evident through a crystalline or milky base. Crystal opals are found throughout Australia, with larger quantities coming from Coober Pedy. White Opal (Light Opal) – this variety has a white or milky white body tone. It can display brilliant colors as vibrant as those of black opals, but the light background tends to soften the visual contrast, making the effect less intense. White opals are particularly common in Coober Pedy and generally more accessible than black or boulder opals. Matrix Opal – a particular variety where the opal is incorporated into a porous rock, such as sandstone or ironstone. After impregnation treatments, the colors can become much more intense as the dark substrate accentuates the opal's play of color. Andamooka is especially famous for these matrix opals, called Andamooka Matrix, which after treatment can resemble the rare black opals from other locations. Value Andamooka opals are particularly appreciated for their relatively affordable prices and rich color patterns. However, high-quality specimens can reach high values, especially those that display an intense play of color or particularly spectacular patterns, such as the harlequin pattern.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028010242373,"sku":"AO062","price":112.47,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/44975_photoroom-018-20250512-194716_73620801-4277-41cf-8c11-dd2d527c9b99.jpg?v=1783985696"},{"product_id":"australian-opal-15ct-cabochon-andamooka-australia-ao054","title":"Australian Opal 15ct – Cabochon – Andamooka, Australia - AO054","description":"\u003cul\u003e\n\u003cli\u003eLocation: Andamooka, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 3g = 15ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 2 x 1.6 x 0.6 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralian Opal is renowned worldwide as the most important source of high-quality opals. The quality of Australian opals is primarily due to their intense and pure play of color. Thanks to specific formation conditions, they often display vibrant and strongly contrasting hues. This diversity is reflected in the numerous varieties of opals offered by Australia: from black and boulder opals to crystal, white, and matrix opals. Australian opals are significantly more durable and stable than many opals from other locations. Their lower natural water content increases resistance to temperature and humidity variations, reducing the risk of cracks or drying out and making them ideal for everyday use in jewelry. Formation Australian opals generally form in sedimentary rocks such as sandstones and clays found in enormous basins, for example, the Great Artesian Basin, a vast underground water system that spans much of the Australian interior. Silica-rich water gradually penetrates small cracks or pores in the rock. As this water evaporates or drains away, thin layers of silica remain in the cavities and can slowly transform into opal. Microscopic spheres of silicon dioxide (silica) play a fundamental role: they arrange themselves in a regular, crystal-like three-dimensional structure. This configuration creates the characteristic \"play of color,\" the iridescent effect visible in the opal when light hits it. The color and intensity of this effect depend on the size and arrangement of these spheres. Deposits Andamooka is a small mining town in South Australia, located approximately 600 kilometers north of Adelaide. It is situated near the salt lake Lake Torrens, in a landscape characterized by an arid climate and harsh conditions. However, in the 1930s, rich opal veins were discovered here, making Andamooka one of Australia's oldest opal mining fields. History Although Andamooka is not as famous as Coober Pedy or Lightning Ridge, opal mining here has a long tradition. Many mines are still family-run and use manual labor or small machinery. In the past, Andamooka, like other Australian mining fields, attracted adventurers seeking precious opal veins and the chance to make their fortune in extreme conditions. Types of Australian opal Black Opal – the rarest and most valuable variety, especially famous for the Lightning Ridge deposit in New South Wales. It has a dark base (black, gray, or dark blue) that enhances the play of color. Black opals often show the most intense color spectrum, including red, green, blue, and purple. Boulder Opal – mainly extracted in Queensland. It forms when opal fills thin veins in iron-rich sandstones or other host rocks. This variety often retains part of the original rock, creating a contrasting base. Boulder opals can have darker tones and thus show a vivid play of color similar to that of black opals. Crystal Opal – characterized by a transparent or translucent base. In its raw state, it can appear almost colorless, but the iridescence becomes evident through a crystalline or milky base. Crystal opals are found throughout Australia, with larger quantities coming from Coober Pedy. White Opal (Light Opal) – this variety has a white or milky white base. It can display colors as brilliant as those of black opals, but the light background tends to attenuate the visual contrast, making the effect less intense. White opals are particularly common in Coober Pedy and generally more accessible than black or boulder opals. Matrix Opal – a particular variety where the opal is embedded in a porous rock, such as sandstone or ironstone. After impregnation treatments, the colors can become much more intense as the dark substrate enhances the opal's play of color. Andamooka is especially famous for these matrix opals, called Andamooka Matrix, which, after treatment, can resemble the rare black opals from other locations. Value Andamooka opals are particularly valued for their relatively affordable prices and rich color patterns. However, high-quality specimens can fetch high values, especially those showing an intense play of color or particularly spectacular patterns, such as the harlequin pattern.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028010275141,"sku":"AO054","price":121.51,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/43463_photoroom-008-20250512-180547_765f8188-0ab9-485b-b790-2782fa87337d.jpg?v=1783985693"},{"product_id":"australian-opal-155ct-cabochon-andamooka-australia-ao058","title":"Australian Opal 15.5ct – Cabochon – Andamooka, Australia - AO058","description":"\u003cul\u003e\n\u003cli\u003eLocation: Andamooka, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 3.1g = 15.5ct\u003c\/li\u003e\n\u003cli\u003eSize: 2.6 x 1.8 x 0.4 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralian Opal is renowned worldwide as the most important source of high-quality opals. The quality of Australian opals is primarily due to their intense and pure play of color. Thanks to specific formation conditions, they often display vibrant and strongly contrasting hues. This diversity is reflected in the many varieties of opals offered by Australia: from black and boulder opals to crystal, white, and matrix opals. Australian opals are significantly more durable and stable than many opals from other locations. Their lower natural water content increases their resistance to temperature and humidity variations, reducing the risk of cracking or drying out and making them ideal for everyday use in jewelry. Formation Australian opals generally form in sedimentary rocks such as sandstones and clays found in vast basins, such as the Great Artesian Basin, an enormous underground water system spanning a large part of the Australian interior. Silica-rich water gradually penetrates small fissures or pores in the rock. As this water evaporates or drains away, thin layers of silica remain in the cavities and can slowly transform into opal. Microscopic spheres of silicon dioxide (silica) play a fundamental role: they arrange themselves in a regular three-dimensional, crystal-like structure. This configuration creates the characteristic \"play of color,\" the iridescent effect visible in opal when light hits it. The color and intensity of this effect depend on the size and arrangement of these spheres. Deposits Andamooka is a small mining town in South Australia located approximately 600 kilometers north of Adelaide. It is situated near the salt lake Lake Torrens, in a landscape characterized by an arid climate and harsh conditions. However, in the 1930s, rich opal veins were discovered here, making Andamooka one of Australia's oldest opal mining fields. History Although Andamooka is not as famous as Coober Pedy or Lightning Ridge, opal mining here has a long tradition. Many mines are still family-run and utilize manual labor or small machinery. In the past, Andamooka, like other Australian mining fields, attracted adventurers seeking valuable opal veins and the chance to make a fortune in extreme conditions. Types of Australian Opal Black Opal – the rarest and most valuable variety, especially famous for the Lightning Ridge deposit in New South Wales. It has a dark base (black, grey, or dark blue) that enhances the play of color. Black opals often display the most intense color spectrum, including red, green, blue, and purple. Boulder Opal – primarily mined in Queensland. It forms when opal fills thin veins in iron-rich sandstones or other host rocks. This variety often retains part of the original rock, creating a contrasting base. Boulder opals can have darker tones and thus show a vibrant play of color similar to black opals. Crystal Opal – characterized by a transparent or translucent base. In its rough state, it can appear almost colorless, but the iridescence becomes evident through a crystalline or milky base. Crystal opals are found throughout Australia, with larger quantities coming from Coober Pedy. White Opal (Light Opal) – this variety has a white or milky white base. It can display brilliant colors similar to black opals, but the light background tends to attenuate the visual contrast, making the effect less intense. White opals are particularly common in Coober Pedy and generally more accessible than black or boulder opals. Matrix Opal – a particular variety in which opal is embedded in a porous rock, such as sandstone or ironstone. After impregnation treatments, the colors can become much more intense as the dark substrate accentuates the opal's play of color. Andamooka is especially famous for these matrix opals, called Andamooka Matrix, which after treatment can resemble rare black opals from other locations. Value Andamooka opals are particularly valued for their relatively accessible prices and rich color patterns. However, high-quality specimens can reach high values, especially those that display an intense play of color or particularly spectacular patterns, such as the harlequin pattern.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028010307909,"sku":"AO058","price":125.4,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/44963_photoroom-006-20250512-194716_e1a0b313-ccf0-46d1-9806-a4bc03339f06.jpg?v=1783985694"},{"product_id":"australian-opal-173ct-cabochon-andamooka-australia-ao055","title":"Australian Opal 17.3ct – Cabochon – Andamooka, Australia - AO055","description":"\u003cul\u003e\n\u003cli\u003eLocation: Andamooka, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 3.4g = 17.3ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 2.9 x 1.7 x 0.5 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralian Opal is renowned worldwide as the most important source of high-quality opals. The quality of Australian opals is primarily due to their intense and pure play of color. Thanks to specific formation conditions, they often display vibrant and strongly contrasting hues. This diversity is reflected in the numerous varieties of opals offered by Australia: from black and boulder opals to crystal, white, and matrix opals. Australian opals are significantly more durable and stable than many opals from other locations. Their lower natural water content increases resistance to changes in temperature and humidity, reducing the risk of cracks or drying out, making them ideal for everyday use in jewelry. Formation Australian opals generally form in sedimentary rocks such as sandstones and clays found in enormous basins, such as the Great Artesian Basin, a vast underground water system that extends over much of the Australian interior. Silica-rich water gradually penetrates small cracks or pores in the rock. When this water evaporates or drains away, thin layers of silica remain in the cavities and can slowly transform into opal. Microscopic spheres of silicon dioxide (silica) play a fundamental role: they arrange themselves in a regular, three-dimensional, crystal-like structure. This configuration creates the characteristic \"play of color,\" the iridescent effect visible in the opal when light strikes it. The color and intensity of this effect depend on the size and arrangement of these spheres. Deposits Andamooka is a small mining town in South Australia located approximately 600 kilometers north of Adelaide. It lies near the salt lake Lake Torrens, in a landscape characterized by an arid climate and harsh conditions. However, in the 1930s, rich opal veins were discovered here, making Andamooka one of Australia's oldest opal mining fields. History Although Andamooka is not as famous as Coober Pedy or Lightning Ridge, opal mining here has a long tradition. Many mines are still family-run and use manual labor or small machinery. In the past, Andamooka, like other Australian mining fields, attracted adventurers seeking precious opal veins and the chance to make their fortune in extreme conditions. Types of Australian Opal Black Opal – the rarest and most valuable variety, famous especially for the Lightning Ridge deposit in New South Wales. It features a dark base (black, gray, or dark blue) that enhances the play of color. Black opals often display the most intense color spectrum, including red, green, blue, and purple. Boulder Opal – primarily mined in Queensland. It forms when opal fills thin veins in iron-rich sandstones or other host rocks. This variety often retains part of the original rock, creating a contrasting base. Boulder Opals can have darker tones and thus show a vibrant play of color similar to that of black opals. Crystal Opal – characterized by a transparent or translucent base. In its rough state, it may appear almost colorless, but the iridescence becomes evident through a crystalline or milky base. Crystal Opals are found throughout Australia, with larger quantities coming from Coober Pedy. White Opal (Light Opal) – this variety has a white or milky-white base. It can display colors as brilliant as those of black opals, but the light background tends to attenuate the visual contrast, making the effect less intense. White opals are particularly common in Coober Pedy and generally more accessible than black or boulder opals. Matrix Opal – a particular variety where opal is embedded in a porous rock, such as sandstone or ironstone. After impregnation treatments, the colors can become much more intense as the dark substrate accentuates the opal's play of color. Andamooka is particularly famous for these matrix opals, called Andamooka Matrix, which after treatment can resemble rare black opals from other locations. Value Andamooka opals are primarily valued for their relatively affordable prices and rich color patterns. However, high-quality specimens can reach high values, especially those that display an intense play of color or particularly spectacular patterns, such as the harlequin pattern.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028010438981,"sku":"AO055","price":139.62,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/43466_photoroom-011-20250512-180547_2048d185-b96a-4fab-ab3d-10042165dbe0.jpg?v=1783985691"},{"product_id":"australian-opal-234ct-cabochon-andamooka-australia-ao056","title":"Australian Opal 23.4ct – Cabochon – Andamooka, Australia - AO056","description":"\u003cul\u003e\n\u003cli\u003eLocation: Andamooka, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 4.6g = 23.4ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 3 x 2.5 x 0.4 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralian Opal is renowned worldwide as the most important source of high-quality opals. The quality of Australian opals is primarily due to their intense and pure play of color. Thanks to specific formation conditions, they often display vibrant and highly contrasting hues. This diversity is reflected in the numerous varieties of opals offered by Australia: from black and boulder opals to crystal, white, and matrix opals. Australian opals are significantly more durable and stable than many opals from other locations. Their lower natural water content increases resistance to temperature and humidity variations, reducing the risk of cracks or desiccation and making them ideal for everyday use in jewelry. Formation Australian opals generally form in sedimentary rocks such as sandstones and clays found in enormous basins, such as the Great Artesian Basin, a vast underground water system that spans much of the Australian interior. Silica-rich water gradually penetrates small fissures or pores in the rock. As this water evaporates or drains away, thin layers of silica remain in the cavities and can slowly transform into opal. Microscopic spheres of silicon dioxide (silica) play a fundamental role: they arrange themselves in a regular three-dimensional, crystal-like structure. This configuration creates the characteristic \"play of color,\" the iridescent effect visible in opal when struck by light. The color and intensity of this effect depend on the size and arrangement of these spheres. Deposits Andamooka is a small mining town in South Australia, located approximately 600 kilometers north of Adelaide. It sits near the salt lake Lake Torrens, in a landscape characterized by an arid climate and harsh conditions. However, rich opal veins were discovered here in the 1930s, making Andamooka one of Australia's oldest opal mining fields. History Although Andamooka is not as famous as Coober Pedy or Lightning Ridge, opal mining here has a long tradition. Many mines are still family-run and use manual labor or small machinery. In the past, Andamooka, like other Australian mining fields, attracted adventurers seeking precious opal veins and the chance to make their fortune in extreme conditions. Types of Australian opal Black Opal – the rarest and most valuable variety, especially famous for the Lightning Ridge deposit in New South Wales. It features a dark base (black, gray, or dark blue) that enhances the play of color. Black opals often show the most intense color spectrum, including red, green, blue, and purple. Boulder Opal – mainly extracted in Queensland. It forms when opal fills thin veins in iron-rich sandstones or other host rocks. This variety often retains part of the original rock, creating a contrasting base. Boulder opals can have darker tones and therefore display a lively play of color similar to black opals. Crystal Opal – characterized by a transparent or translucent base. In its raw state, it can appear almost colorless, but iridescence becomes evident through a crystalline or milky base. Crystal opals are found throughout Australia, with larger quantities coming from Coober Pedy. White Opal (Light Opal) – this variety has a white or milky white base. It can display colors as brilliant as those of black opals, but the light background tends to attenuate the visual contrast, making the effect less intense. White opals are particularly common in Coober Pedy and generally more accessible than black or boulder opals. Matrix Opal – a particular variety where opal is embedded in a porous rock, such as sandstone or ironstone. After impregnation treatments, the colors can become much more intense as the dark substrate accentuates the opal's play of color. Andamooka is especially famous for these matrix opals, called Andamooka Matrix, which after treatment can resemble rare black opals from other locations. Value Andamooka opals are particularly valued for their relatively accessible prices and rich color patterns. However, high-quality specimens can reach high values, especially those that show an intense play of color or particularly spectacular patterns, such as the harlequin pattern.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028010504517,"sku":"AO056","price":189.39,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/43469_photoroom-012-20250512-180547_5d44b6b2-f103-4b7f-bc7a-9f97fd9097d5.jpg?v=1783985689"},{"product_id":"australian-opal-268ct-cabochon-andamooka-australia-ao010","title":"26.8ct Australian Opal – Cabochon – Andamooka, Australia - AO010","description":"\u003cul\u003e\n\u003cli\u003eLocation: Andamooka, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 5.3g = 26.8ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 3.8 x 1.8 x 0.5 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralian opal is renowned worldwide as the most important source of high-quality opals. The quality of Australian opals is primarily due to their intense and pure play of color. Thanks to specific formation conditions, they often display vibrant and strongly contrasting hues. This diversity is reflected in the numerous varieties of opals offered by Australia: from black and boulder opals to crystal, white, and matrix opals. Australian opals are significantly more durable and stable than many opals from other locations. Their lower natural water content increases resistance to temperature and humidity variations, reducing the risk of cracks or drying out and making them ideal for everyday use in jewelry. Formation Australian opals generally form in sedimentary rocks such as sandstones and clays found in enormous basins, for example, the Great Artesian Basin, a vast underground water system that extends over much of the Australian interior. Silica-rich water gradually penetrates the small fissures or pores of the rock. When this water evaporates or drains away, thin layers of silica remain in the cavities and can slowly transform into opal. Microscopic spheres of silicon dioxide (silica) play a fundamental role: they arrange themselves in a regular three-dimensional, crystal-like structure. This configuration creates the characteristic \"play of color,\" the iridescent effect visible in opal when light hits it. The color and intensity of this effect depend on the size and arrangement of these spheres. Deposits Andamooka is a small mining town in South Australia located approximately 600 kilometers north of Adelaide. It lies near the salt lake Lake Torrens, in a landscape characterized by an arid climate and difficult conditions. However, in the 1930s, rich opal veins were discovered here, making Andamooka one of Australia's oldest opal mining fields. History Although Andamooka is not as famous as Coober Pedy or Lightning Ridge, opal mining here has a long tradition. Many mines are still family-run and use manual labor or small machinery. In the past, Andamooka, like other Australian mining fields, attracted adventurers seeking precious opal veins and the chance to make their fortune in extreme conditions. Types of Australian Opal Black Opal – the rarest and most valuable variety, especially famous for the Lightning Ridge deposit in New South Wales. It features a dark base (black, grey, or dark blue) that enhances the play of color. Black opals often show the most intense color spectrum, including red, green, blue, and purple. Boulder Opal – primarily mined in Queensland. It forms when opal fills thin veins in iron-rich sandstones or other host rocks. This variety often retains part of the original rock, creating a contrasting base. Boulder opals can have darker tones and thus display a lively play of color similar to that of black opals. Crystal Opal – characterized by a transparent or translucent base. In its raw state, it can appear almost colorless, but the iridescence becomes evident through a crystalline or milky base. Crystal opals are found throughout Australia, with larger quantities coming from Coober Pedy. White Opal (Light Opal) – this variety has a white or milky white base. It can display brilliant colors as vibrant as those of black opals, but the light background tends to dampen the visual contrast, making the effect less intense. White opals are particularly common in Coober Pedy and generally more accessible than black or boulder opals. Matrix Opal – a particular variety in which the opal is embedded in a porous rock, such as sandstone or ironstone. After impregnation treatments, the colors can become much more intense as the dark substrate accentuates the opal's play of color. Andamooka is particularly famous for these matrix opals, called Andamooka Matrix, which after treatment can resemble rare black opals from other locations. Value Andamooka opals are particularly valued for their relatively affordable prices and rich color patterns. However, high-quality specimens can reach high values, especially those that display an intense play of color or particularly spectacular patterns, such as the harlequin pattern.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028010602821,"sku":"AO010","price":190.67,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/33254_australian-opal-26-8ct---cabochon---andamooka--australia_f94d2fd9-e490-44fb-8049-4bcd67c3c52a.jpg?v=1783985690"},{"product_id":"australian-opal-301ct-cabochon-andamooka-australia-ao050","title":"Australian Opal 30.1ct – Cabochon – Andamooka, Australia - AO050","description":"\u003cul\u003e\n\u003cli\u003eLocation: Andamooka, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 6g = 30.1ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 3.7 x 1.7 x 0.7 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralian opal is renowned worldwide as the most important source of high-quality opals. The quality of Australian opals is primarily due to their intense and pure play of colour. Thanks to specific formation conditions, they often display vibrant and strongly contrasting hues. This diversity is reflected in the numerous varieties of opals offered by Australia: from black and boulder opals to crystal, white, and matrix opals. Australian opals are significantly more durable and stable than many opals from other locations. Their lower natural water content increases resistance to temperature and humidity variations, reducing the risk of cracks or drying out and making them ideal for everyday use in jewellery. Formation Australian opals generally form in sedimentary rocks such as sandstones and clays found in enormous basins, for example, the Great Artesian Basin, a vast underground water system that extends over a large part of the Australian interior. Silica-rich water gradually penetrates small fissures or pores in the rock. When this water evaporates or drains away, thin layers of silica remain in the cavities and can slowly transform into opal. Microscopic spheres of silicon dioxide (silica) play a crucial role: they arrange themselves in a regular three-dimensional crystal-like structure. This configuration creates the characteristic “play of colour,” the iridescent effect visible in opal when light hits it. The colour and intensity of this effect depend on the size and arrangement of these spheres. Deposits Andamooka is a small mining town in South Australia located approximately 600 kilometres north of Adelaide. It lies near the salt lake Lake Torrens, in a landscape characterized by an arid climate and difficult conditions. However, in the 1930s, rich opal veins were discovered here, making Andamooka one of Australia's oldest opal mining fields. History Although Andamooka is not as famous as Coober Pedy or Lightning Ridge, opal mining here has a long tradition. Many mines are still family-run and use manual labour or small machinery. In the past, Andamooka, like other Australian mining fields, attracted adventurers seeking precious opal veins and the chance to make their fortune in extreme conditions. Types of Australian opal Black Opal – the rarest and most valuable variety, famous especially for the Lightning Ridge deposit in New South Wales. It features a dark base (black, grey, or dark blue) that enhances the play of colour. Black opals often show the most intense colour spectrum, including red, green, blue, and purple. Boulder Opal – mainly extracted in Queensland. It forms when opal fills thin veins in iron-rich sandstones or other host rocks. This variety often retains part of the original rock, creating a contrasting base. Boulder opals can have darker tones and thus display a lively play of colour similar to black opals. Crystal Opal – characterized by a transparent or translucent base. In its raw state, it can appear almost colourless, but the iridescence becomes evident through a crystalline or milky base. Crystal opals are found throughout Australia, with larger quantities coming from Coober Pedy. White Opal (Light Opal) – this variety has a white or milky white base. It can display colours as brilliant as black opals, but the light background tends to soften the visual contrast, making the effect less intense. White opals are particularly common in Coober Pedy and generally more accessible than black or boulder opals. Matrix Opal – a particular variety where opal is embedded in a porous rock, such as sandstone or ironstone. After impregnation treatments, the colours can become much more intense as the dark substrate accentuates the opal's play of colour. Andamooka is especially famous for these matrix opals, called Andamooka Matrix, which after treatment can resemble rare black opals from other locations. Value Andamooka opals are particularly appreciated for their relatively affordable prices and rich colour patterns. However, high-quality specimens can reach high values, especially those that show an intense play of colour or particularly spectacular patterns, such as the harlequin pattern.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028010635589,"sku":"AO050","price":213.3,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/43451_australian-opal-30-1ct---cabochon---andamooka--australia_6fbe4a4c-545b-48ed-a9e8-7dff299e8fd5.jpg?v=1783985689"},{"product_id":"australian-opal-44ct-cabochon-andamooka-australia-ao060","title":"Australian Opal 4.4ct – Cabochon – Andamooka, Australia - AO060","description":"\u003cul\u003e\n\u003cli\u003eLocation: Andamooka, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 0.8g = 4.4ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 1.6 x 1 x 0.4 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralian Opal is renowned worldwide as the most important source of high-quality opals. The quality of Australian opals is primarily due to their intense and pure play of color. Thanks to specific formation conditions, they often display vibrant and strongly contrasting hues. This diversity is reflected in the numerous varieties of opals offered by Australia: from black and boulder opals to crystal, white, and matrix opals. Australian opals are significantly more durable and stable compared to many opals from other locations. Their naturally lower water content increases resistance to temperature and humidity variations, reducing the risk of cracks or drying out, and making them ideal for everyday use in jewelry. Formation Australian opals generally form in sedimentary rocks such as sandstones and clays found in enormous basins, for example, the Great Artesian Basin, a vast underground water system that spans a large part of the Australian interior. Silica-rich water gradually penetrates small fissures or pores in the rock. When this water evaporates or drains away, thin layers of silica remain in the cavities and can slowly transform into opal. Microscopic spheres of silicon dioxide (silica) play a fundamental role: they arrange themselves in a regular three-dimensional crystal-like structure. This configuration creates the characteristic “play of color,” the iridescent effect visible in opal when light hits it. The color and intensity of this effect depend on the size and arrangement of these spheres. Deposits Andamooka is a small mining town in South Australia located approximately 600 kilometers north of Adelaide. It lies near the salt lake Lake Torrens, in a landscape characterized by an arid climate and difficult conditions. However, rich opal veins were discovered here in the 1930s, making Andamooka one of Australia's oldest opal mining fields. History Although Andamooka is not as famous as Coober Pedy or Lightning Ridge, opal mining here has a long tradition. Many mines are still family-run and use manual labor or small machinery. In the past, Andamooka, like other Australian mining fields, attracted adventurers seeking precious opal veins and the chance to make a fortune under extreme conditions. Types of Australian Opal Black Opal – the rarest and most precious variety, especially famous for the Lightning Ridge deposit in New South Wales. It features a dark base (black, grey, or dark blue) that enhances the play of color. Black opals often show the most intense color spectrum, including red, green, blue, and purple. Boulder Opal – mainly extracted in Queensland. It forms when opal fills thin veins in iron-rich sandstones or other host rocks. This variety often retains part of the original rock, creating a contrasting base. Boulder opals can have darker tones and thus show a vivid play of color similar to black opals. Crystal Opal – characterized by a transparent or translucent base. In its rough state, it can appear almost colorless, but the iridescence becomes evident through a crystalline or milky base. Crystal opals are found throughout Australia, with larger quantities coming from Coober Pedy. White Opal (Light Opal) – this variety has a white or milky white base. It can display colors as brilliant as those of black opals, but the light background tends to attenuate the visual contrast, making the effect less intense. White opals are particularly common in Coober Pedy and generally more accessible than black or boulder opals. Matrix Opal – a particular variety where the opal is embedded in a porous rock, such as sandstone or ironstone. After impregnation treatments, the colors can become much more intense as the dark substrate accentuates the opal's play of color. Andamooka is most famous for these matrix opals, called Andamooka Matrix, which after treatment can resemble rare black opals from other locations. Value Andamooka opals are particularly valued for their relatively affordable prices and rich color patterns. However, high-quality specimens can reach high values, especially those showing an intense play of color or particularly spectacular patterns, such as the harlequin pattern.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028010701125,"sku":"AO060","price":35.55,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/44969_photoroom-012-20250512-194716_0a972a73-c832-4811-80bd-5062504dc295.jpg?v=1783985688"},{"product_id":"australian-opal-67ct-cabochon-andamooka-australia-ao053","title":"Australian Opal 6.7ct – Cabochon – Andamooka, Australia - AO053","description":"\u003cul\u003e\n\u003cli\u003eLocation: Andamooka, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 1.3g = 6.7ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 1.8 x 1.4 x 0.4 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralian opal is renowned worldwide as the most important source of high-quality opals. The quality of Australian opals is primarily due to their intense and pure play of color. Thanks to specific formation conditions, they often display vibrant and highly contrasting hues. This diversity is reflected in the numerous varieties of opals offered by Australia: from black and boulder opals to crystal, white, and matrix opals. Australian opals are noticeably more durable and stable than many opals from other locations. Their lower natural water content increases resistance to variations in temperature and humidity, reducing the risk of cracking or drying out and making them ideal for everyday use in jewelry. Formation Australian opals generally form in sedimentary rocks such as sandstones and clays found in enormous basins, such as the Great Artesian Basin, a vast underground water system extending over much of the Australian interior. Silica-rich water gradually penetrates small cracks or pores in the rock. When this water evaporates or drains away, thin layers of silica remain in the cavities and can slowly transform into opal. Microscopic spheres of silicon dioxide (silica) play a fundamental role: they arrange themselves in a regular three-dimensional crystal-like structure. This configuration creates the characteristic \"play of color,\" the iridescent effect visible in opal when light hits it. The color and intensity of this effect depend on the size and arrangement of these spheres. Deposits Andamooka is a small mining town in South Australia located approximately 600 kilometers north of Adelaide. It lies near the salt lake Lake Torrens, in a landscape characterized by an arid climate and harsh conditions. However, rich opal veins were discovered here in the 1930s, making Andamooka one of Australia's oldest opal mining fields. History Although Andamooka is not as famous as Coober Pedy or Lightning Ridge, opal mining here has a long tradition. Many mines are still family-run and use manual labor or small machinery. In the past, Andamooka, like other Australian mining fields, attracted adventurers seeking precious opal veins and the chance to strike it rich in extreme conditions. Types of Australian Opal Black Opal – the rarest and most valuable variety, famous especially for the Lightning Ridge deposit in New South Wales. It has a dark base (black, gray, or dark blue) which enhances the play of color. Black opals often show the most intense color spectrum, including red, green, blue, and purple. Boulder Opal – mainly extracted in Queensland. It forms when opal fills thin veins in iron-rich sandstones or other host rocks. This variety often retains part of the original rock, creating a contrasting base. Boulder opals can have darker tones and therefore display a lively play of color similar to black opals. Crystal Opal – characterized by a transparent or translucent base. In its raw state, it can appear almost colorless, but the iridescence becomes evident through a crystalline or milky base. Crystal opals are found throughout Australia, with larger quantities coming from Coober Pedy. White Opal (Light Opal) – this variety has a white or milky white base. It can show colors as brilliant as black opals, but the light background tends to attenuate the visual contrast, making the effect less intense. White opals are particularly common in Coober Pedy and generally more accessible than black or boulder opals. Matrix Opal – a particular variety where opal is embedded in a porous rock, such as sandstone or ironstone. After impregnation treatments, the colors can become much more intense as the dark substrate accentuates the opal's play of color. Andamooka is especially famous for these matrix opals, called Andamooka Matrix, which after treatment can resemble rare black opals from other locations. Value Andamooka opals are particularly valued for their relatively affordable prices and rich color patterns. However, high-quality specimens can reach high values, especially those showing an intense play of color or particularly spectacular patterns, such as the harlequin pattern.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028010733893,"sku":"AO053","price":54.3,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/43460_photoroom-006-20250512-180547_cec13f88-7d22-4476-9ca5-77eb8dff38b5.jpg?v=1783985686"},{"product_id":"boulder-opal-17ct-cabochon-queensland-australia-bo013","title":"Boulder opal 1.7ct – Cabochon – Queensland, Australia - BO013","description":"\u003cul\u003e\n\u003cli\u003eLocation: Queensland, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 0.34g = 1.7ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 0.84 x 0.6 x 0.28 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralia is renowned worldwide as the most important source of high-quality Opals. The quality of Australian Opals is primarily due to their strong and pure play of color. Thanks to specific formation conditions, they often exhibit vivid, contrasting hues. This diversity is reflected in the many types of Opals Australia offers—from black and boulder Opals to crystal, white, and matrix Opals. Australian Opals are notably more durable and stable compared to many Opals from other localities. Their naturally lower water content increases their ability to withstand temperature fluctuations and changes in humidity, which means they do not crack or dry out as easily, making them ideal for everyday wear in jewelry.\nFormation\nAustralian Opals typically form in sedimentary rocks such as sandstones and clays, which are found in extensive basins (e.g., the Great Artesian Basin—a vast underground water system covering much of Australia’s interior). Water rich in silica gradually seeps into fine cracks or pores within the rock. Once this water evaporates or drains away, thin layers of silica remain in the cavities, which can eventually transform into Opal.\nA key role is played by microscopic spheres of silicon dioxide (silica) that arrange themselves into a regular three-dimensional “crystal-like” structure. This arrangement produces the typical “play-of-color” phenomenon, the rainbow-like shimmer visible in Opal when light strikes it. The color and intensity of this play-of-color depend on the size and arrangement of these spheres.\nIn the case of boulder Opals from Australia’s Queensland, the fundamental formation process is the same, but the Opal settles in thin veins or cavities within iron-rich parent rock. The dark color and high iron content of the host rock often enhance the contrast and richness of the Opal’s color effects.\nLocalities\nQueensland is one of the key areas in Australia for boulder Opals. It spans the continent’s northeast, where much of the interior is arid or semi-arid land. This region hosts significant Opal-mining sites. The most famous places include Winton, Quilpie, Opalton, and Koroit, each of which significantly contributes to the global prestige of Australian Opals.\nHistory\nOpal mining in Queensland began around the turn of the 19th and 20th centuries, when adventurers and settlers sought new means of livelihood in the unforgiving landscape. Conditions here remain harsh—heat and drought affect mining work but also help preserve Opal deposits by minimizing damage from surface water. Many mines are still owned by small family businesses that rely on traditional techniques, supplemented by modern machinery.\nTypes of Australian Opals\nBlack OpalThe rarest and most valuable type of Opal, made famous by the Lightning Ridge deposit (New South Wales). It has a dark base color (black, gray, or dark blue), which emphasizes the play of color. Black Opals often display the most intense range of colors—red, green, blue, or purple.\nBoulder Opal ✓\nPrimarily mined in Queensland (northeastern Australia). It forms when Opal fills thin seams in ironstone or other types of parent rock (“boulder”). This type usually retains part of the original rock, creating a contrasting background. Boulder Opals can have a darker body tone, and thus can—like black Opals—exhibit a vibrant play of color.\nCrystal Opal Characterized by a translucent or transparent base. Sometimes it can be almost colorless in its uncut state, but the flashes of color shine through the crystal-clear or milky translucent base. Crystal Opals occur throughout Australia, though many come from Coober Pedy.\nWhite (Light) Opal This variety has a white to milky-white base color. It can display similarly vibrant colors to black Opal, but they tend to be less pronounced because the light background visually “mutes” the contrast. White Opal is most commonly found in Coober Pedy (South Australia) and is more affordable than black or boulder Opals.\nMatrix OpalA distinct variety in which Opal is dispersed within a porous host rock (such as sandstone or ironstone). After treatment (impregnation), the colors can become much more intense, as the darker background enhances the Opal’s play of color. Andamooka is especially famous for this type of matrix Opal, known as Andamooka Matrix, which can resemble rare black Opals from other localities once treated.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028010864965,"sku":"BO013","price":216.53,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/41531_photoroom-001-20250402-002040_8bf8691f-ce39-47cb-993e-ce54991d803b.jpg?v=1783985684"},{"product_id":"australian-opal-332ct-cabochon-andamooka-australia-ao002","title":"Australian Opal 33.2ct – Cabochon – Andamooka, Australia - AO002","description":"\u003cul\u003e\n\u003cli\u003eLocation: Andamooka, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 6.6g = 33.2ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 3 x 2.5 x 0.5 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralian opal is renowned worldwide as the most important source of high-quality opals. The quality of Australian opals is primarily due to their intense and pure play-of-colour. Thanks to specific formation conditions, they often exhibit vibrant and highly contrasting hues. This diversity is reflected in the numerous varieties of opals offered by Australia: from black and boulder opals to crystal, white, and matrix opals. Australian opals are significantly more durable and stable than many opals from other locations. Their lower natural water content increases their resistance to temperature and humidity variations, reducing the risk of cracking or drying out, making them ideal for everyday use in jewellery. Formation Australian opals generally form in sedimentary rocks such as sandstones and clays found in enormous basins, for example, the Great Artesian Basin, a vast underground water system extending over much of inland Australia. Silica-rich water gradually penetrates small fissures or pores in the rock. When this water evaporates or drains away, thin layers of silica remain in the cavities and can slowly transform into opal. Microscopic spheres of silicon dioxide (silica) play a fundamental role: they arrange themselves in a regular three-dimensional structure similar to a crystal. This configuration creates the characteristic \"play-of-colour,\" the iridescent effect visible in opal when light hits it. The colour and intensity of this effect depend on the size and arrangement of these spheres. Deposits Andamooka is a small mining town in South Australia located approximately 600 kilometres north of Adelaide. It lies near the salt lake Lake Torrens, in a landscape characterised by an arid climate and difficult conditions. However, in the 1930s, rich opal veins were discovered here, making Andamooka one of Australia's oldest opal mining fields. History Although Andamooka is not as famous as Coober Pedy or Lightning Ridge, opal mining here has a long tradition. Many mines are still family-run and use manual labour or small machinery. In the past, Andamooka, like other Australian mining fields, attracted adventurers seeking valuable opal veins and the chance to make their fortune in extreme conditions. Types of Australian Opal Black Opal – the rarest and most valuable variety, famous especially for the Lightning Ridge deposit in New South Wales. It features a dark base (black, grey, or dark blue) that enhances the play-of-colour. Black opals often show the most intense colour spectrum, including red, green, blue, and purple. Boulder Opal – primarily mined in Queensland. It forms when opal fills thin veins in iron-rich sandstones or other host rocks. This variety often retains part of the original rock, creating a contrasting base. Boulder opals can have darker tones and thus show a vibrant play-of-colour similar to black opals. Crystal Opal – characterised by a transparent or translucent base. In its rough state, it can appear almost colourless, but iridescence becomes evident through a crystalline or milky base. Crystal opals are found throughout Australia, with larger quantities coming from Coober Pedy. White Opal (Light Opal) – this variety has a white or milky-white base. It can show colours as brilliant as black opals, but the light background tends to attenuate the visual contrast, making the effect less intense. White opals are particularly common in Coober Pedy and generally more accessible than black or boulder opals. Matrix Opal – a particular variety where opal is embedded in a porous rock, such as sandstone or ironstone. After impregnation treatments, the colours can become much more intense as the dark substrate accentuates the opal's play-of-colour. Andamooka is especially famous for these matrix opals, called Andamooka Matrix, which, after treatment, can resemble the rare black opals from other locations. Value Andamooka opals are particularly valued for their relatively affordable prices and rich colour patterns. However, high-quality specimens can fetch high values, especially those that exhibit an intense play-of-colour or particularly spectacular patterns, such as the harlequin pattern.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028010930501,"sku":"AO002","price":215.24,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/33230-5_australian-opal-33-2ct---cabochon---andamooka--australia_21a60132-97f1-4ed1-b2d0-d0c292516f17.jpg?v=1783985687"},{"product_id":"boulder-opal-1865ct-cabochon-koroit-queensland-australia-bo021","title":"Boulder Opal 18.65ct – Cabochon – Koroit, Queensland, Australia - BO021","description":"\u003cul\u003e\n\u003cli\u003eLocation: Koroit, Queensland, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 3.7g = 18.65ct\u003c\/li\u003e\n\u003cli\u003eSize: 2.3 x 1.5 x 0.5 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralia is renowned worldwide as the most important source of high-quality opals. The quality of Australian opals is primarily due to their strong and pure play of color. Thanks to specific formation conditions, they often exhibit vivid, contrasting hues. This diversity is reflected in the many types of opals Australia offers—from black and boulder opals to crystal, white, and matrix opals. Australian opals are notably more durable and stable compared to many opals from other localities. Their naturally lower water content increases their ability to withstand temperature fluctuations and changes in humidity, which means they do not crack or dry out as easily, making them ideal for everyday wear in jewelry.\nFormation\nAustralian opals typically form in sedimentary rocks such as sandstones and clays, which are found in extensive basins (e.g., the Great Artesian Basin—a vast underground water system covering much of Australia’s interior). Water rich in silica gradually seeps into fine cracks or pores within the rock. Once this water evaporates or drains away, thin layers of silica remain in the cavities, which can eventually transform into opal.\nA key role is played by microscopic spheres of silicon dioxide (silica) that arrange themselves into a regular three-dimensional “crystal-like” structure. This arrangement produces the typical “play-of-color” phenomenon, the rainbow-like shimmer visible in opal when light strikes it. The color and intensity of this play-of-color depend on the size and arrangement of these spheres.\nIn the case of boulder opals from Australia’s Queensland, the fundamental formation process is the same, but the opal settles in thin veins or cavities within iron-rich parent rock. The dark color and high iron content of the host rock often enhance the contrast and richness of the opal’s color effects.\nLocalities\nQueensland is one of the key areas in Australia for boulder opals. It spans the continent’s northeast, where much of the interior is arid or semi-arid land. This region hosts significant opal-mining sites. The most famous places include Winton, Quilpie, Opalton, and Koroit, each of which significantly contributes to the global prestige of Australian opals.\nHistory\nOpal mining in Queensland began around the turn of the 19th and 20th centuries, when adventurers and settlers sought new means of livelihood in the unforgiving landscape. Conditions here remain harsh—heat and drought affect mining work but also help preserve opal deposits by minimizing damage from surface water. Many mines are still owned by small family businesses that rely on traditional techniques, supplemented by modern machinery.\nTypes of Australian Opals\nBlack Opal The rarest and most valuable type of opal, made famous by the Lightning Ridge deposit (New South Wales). It has a dark base color (black, gray, or dark blue), which emphasizes the play of color. Black opals often display the most intense range of colors—red, green, blue, or purple.\nBoulder Opal ✓\nPrimarily mined in Queensland (northeastern Australia). It forms when opal fills thin seams in ironstone or other types of parent rock (“boulder”). This type usually retains part of the original rock, creating a contrasting background. Boulder opals can have a darker body tone, and thus can—like black opals—exhibit a vibrant play of color.\nCrystal Opal Characterized by a translucent or transparent base. Sometimes it can be almost colorless in its uncut state, but the flashes of color shine through the crystal-clear or milky translucent base. Crystal opals occur throughout Australia, though many come from Coober Pedy.\nWhite (Light) Opal This variety has a white to milky-white base color. It can display similarly vibrant colors to black opal, but they tend to be less pronounced because the light background visually “mutes” the contrast. White opal is most commonly found in Coober Pedy (South Australia) and is more affordable than black or boulder opals.\nMatrix Opal A distinct variety in which opal is dispersed within a porous host rock (such as sandstone or ironstone). After treatment (impregnation), the colors can become much more intense, as the darker background enhances the opal’s play of color. Andamooka is especially famous for this type of matrix opal, known as Andamooka Matrix, which can resemble rare black opals from other localities once treated.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028010963269,"sku":"BO021","price":128.63,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/43031_boulder-opal-18-65ct---cabochon---koroit--queensland--australia_703ca580-c32c-4256-bdf2-c0a1f1a260f0.jpg?v=1783985681"},{"product_id":"boulder-opal-185ct-cabochon-queensland-australia-bo008","title":"Boulder opal 18.5ct – Cabochon – Queensland, Australia - BO008","description":"\u003cul\u003e\n\u003cli\u003eLocation: Queensland, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 3.7g = 18.5ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 1.6 x 1.8 x 0.7 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralia is renowned worldwide as the most important source of high-quality Opals. The quality of Australian Opals is primarily due to their strong and pure play of color. Thanks to specific formation conditions, they often exhibit vivid, contrasting hues. This diversity is reflected in the many types of Opals Australia offers—from black and boulder Opals to crystal, white, and matrix Opals. Australian Opals are notably more durable and stable compared to many Opals from other localities. Their naturally lower water content increases their ability to withstand temperature fluctuations and changes in humidity, which means they do not crack or dry out as easily, making them ideal for everyday wear in jewelry.\nFormation\nAustralian Opals typically form in sedimentary rocks such as sandstones and clays, which are found in extensive basins (e.g., the Great Artesian Basin—a vast underground water system covering much of Australia’s interior). Water rich in silica gradually seeps into fine cracks or pores within the rock. Once this water evaporates or drains away, thin layers of silica remain in the cavities, which can eventually transform into Opal.\nA key role is played by microscopic spheres of silicon dioxide (silica) that arrange themselves into a regular three-dimensional “crystal-like” structure. This arrangement produces the typical “play-of-color” phenomenon, the rainbow-like shimmer visible in Opal when light strikes it. The color and intensity of this play-of-color depend on the size and arrangement of these spheres.\nIn the case of boulder Opals from Australia’s Queensland, the fundamental formation process is the same, but the Opal settles in thin veins or cavities within iron-rich parent rock. The dark color and high iron content of the host rock often enhance the contrast and richness of the Opal’s color effects.\nLocalities\nQueensland is one of the key areas in Australia for boulder Opals. It spans the continent’s northeast, where much of the interior is arid or semi-arid land. This region hosts significant Opal-mining sites. The most famous places include Winton, Quilpie, Opalton, and Koroit, each of which significantly contributes to the global prestige of Australian Opals.\nHistory\nOpal mining in Queensland began around the turn of the 19th and 20th centuries, when adventurers and settlers sought new means of livelihood in the unforgiving landscape. Conditions here remain harsh—heat and drought affect mining work but also help preserve Opal deposits by minimizing damage from surface water. Many mines are still owned by small family businesses that rely on traditional techniques, supplemented by modern machinery.\nTypes of Australian Opals\nBlack OpalThe rarest and most valuable type of Opal, made famous by the Lightning Ridge deposit (New South Wales). It has a dark base color (black, gray, or dark blue), which emphasizes the play of color. Black Opals often display the most intense range of colors—red, green, blue, or purple.\nBoulder Opal ✓\nPrimarily mined in Queensland (northeastern Australia). It forms when Opal fills thin seams in ironstone or other types of parent rock (“boulder”). This type usually retains part of the original rock, creating a contrasting background. Boulder Opals can have a darker body tone, and thus can—like black Opals—exhibit a vibrant play of color.\nCrystal Opal Characterized by a translucent or transparent base. Sometimes it can be almost colorless in its uncut state, but the flashes of color shine through the crystal-clear or milky translucent base. Crystal Opals occur throughout Australia, though many come from Coober Pedy.\nWhite (Light) Opal This variety has a white to milky-white base color. It can display similarly vibrant colors to black Opal, but they tend to be less pronounced because the light background visually “mutes” the contrast. White Opal is most commonly found in Coober Pedy (South Australia) and is more affordable than black or boulder Opals.\nMatrix OpalA distinct variety in which Opal is dispersed within a porous host rock (such as sandstone or ironstone). After treatment (impregnation), the colors can become much more intense, as the darker background enhances the Opal’s play of color. Andamooka is especially famous for this type of matrix Opal, known as Andamooka Matrix, which can resemble rare black Opals from other localities once treated.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028011028805,"sku":"BO008","price":96.31,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/6447_boulder-opal-18-5ct---cabochon---queensland--australia_2bdacfa1-4609-4600-acf8-02b548caf1c8.jpg?v=1783985684"},{"product_id":"boulder-opal-223ct-cabochon-queensland-australia-bo002","title":"Boulder Opal 22.3ct – Cabochon – Queensland, Australia - BO002","description":"\u003cul\u003e\n\u003cli\u003eLocation: Queensland, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 4.4g = 22.3ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 2.6 x 1.9 x 0.5 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralia is renowned worldwide as the most important source of high-quality opals. The quality of Australian opals is primarily due to their strong and pure play of color. Thanks to specific formation conditions, they often exhibit vivid, contrasting hues. This diversity is reflected in the many types of opals Australia offers—from black and boulder opals to crystal, white, and matrix opals. Australian opals are notably more durable and stable compared to many opals from other localities. Their naturally lower water content increases their ability to withstand temperature fluctuations and changes in humidity, which means they do not crack or dry out as easily, making them ideal for everyday wear in jewelry.\nFormation\nAustralian opals typically form in sedimentary rocks such as sandstones and clays, which are found in extensive basins (e.g., the Great Artesian Basin—a vast underground water system covering much of Australia’s interior). Water rich in silica gradually seeps into fine cracks or pores within the rock. Once this water evaporates or drains away, thin layers of silica remain in the cavities, which can eventually transform into opal.\nA key role is played by microscopic spheres of silicon dioxide (silica) that arrange themselves into a regular three-dimensional “crystal-like” structure. This arrangement produces the typical “play-of-color” phenomenon, the rainbow-like shimmer visible in opal when light strikes it. The color and intensity of this play-of-color depend on the size and arrangement of these spheres.\nIn the case of boulder opals from Australia’s Queensland, the fundamental formation process is the same, but the opal settles in thin veins or cavities within iron-rich parent rock. The dark color and high iron content of the host rock often enhance the contrast and richness of the opal’s color effects.\nLocalities\nQueensland is one of the key areas in Australia for boulder opals. It spans the continent’s northeast, where much of the interior is arid or semi-arid land. This region hosts significant opal-mining sites. The most famous places include Winton, Quilpie, Opalton, and Koroit, each of which significantly contributes to the global prestige of Australian opals.\nHistory\nOpal mining in Queensland began around the turn of the 19th and 20th centuries, when adventurers and settlers sought new means of livelihood in the unforgiving landscape. Conditions here remain harsh—heat and drought affect mining work but also help preserve opal deposits by minimizing damage from surface water. Many mines are still owned by small family businesses that rely on traditional techniques, supplemented by modern machinery.\nTypes of Australian Opals\nBlack Opal The rarest and most valuable type of opal, made famous by the Lightning Ridge deposit (New South Wales). It has a dark base color (black, gray, or dark blue), which emphasizes the play of color. Black opals often display the most intense range of colors—red, green, blue, or purple.\nBoulder Opal ✓\nPrimarily mined in Queensland (northeastern Australia). It forms when opal fills thin seams in ironstone or other types of parent rock (“boulder”). This type usually retains part of the original rock, creating a contrasting background. Boulder opals can have a darker body tone, and thus can—like black opals—exhibit a vibrant play of color.\nCrystal Opal Characterized by a translucent or transparent base. Sometimes it can be almost colorless in its uncut state, but the flashes of color shine through the crystal-clear or milky translucent base. Crystal opals occur throughout Australia, though many come from Coober Pedy.\nWhite (Light) Opal This variety has a white to milky-white base color. It can display similarly vibrant colors to black opal, but they tend to be less pronounced because the light background visually “mutes” the contrast. White opal is most commonly found in Coober Pedy (South Australia) and is more affordable than black or boulder opals.\nMatrix Opal A distinct variety in which opal is dispersed within a porous host rock (such as sandstone or ironstone). After treatment (impregnation), the colors can become much more intense, as the darker background enhances the opal’s play of color. Andamooka is especially famous for this type of matrix opal, known as Andamooka Matrix, which can resemble rare black opals from other localities once treated.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028011094341,"sku":"BO002","price":232.05,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/6429_boulder-opal-22-3ct---cabochon---queensland--australia_c15ab765-ab75-4e0e-aec7-c6e79655dfba.jpg?v=1783985681"},{"product_id":"boulder-opal-22ct-cabochon-queensland-australia-bo004","title":"Boulder opal 22ct – Cabochon – Queensland, Australia - BO004","description":"\u003cul\u003e\n\u003cli\u003eLocation: Queensland, Australia\u003c\/li\u003e\n\u003cli\u003eWeight: 4.4g = 22ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 3.3 x 1.2 x 0.6 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAustralia is renowned worldwide as the most important source of high-quality Opals. The quality of Australian Opals is primarily due to their strong and pure play of color. Thanks to specific formation conditions, they often exhibit vivid, contrasting hues. This diversity is reflected in the many types of Opals Australia offers—from black and boulder Opals to crystal, white, and matrix Opals. Australian Opals are notably more durable and stable compared to many Opals from other localities. Their naturally lower water content increases their ability to withstand temperature fluctuations and changes in humidity, which means they do not crack or dry out as easily, making them ideal for everyday wear in jewelry.\nFormation\nAustralian Opals typically form in sedimentary rocks such as sandstones and clays, which are found in extensive basins (e.g., the Great Artesian Basin—a vast underground water system covering much of Australia’s interior). Water rich in silica gradually seeps into fine cracks or pores within the rock. Once this water evaporates or drains away, thin layers of silica remain in the cavities, which can eventually transform into Opal.\nA key role is played by microscopic spheres of silicon dioxide (silica) that arrange themselves into a regular three-dimensional “crystal-like” structure. This arrangement produces the typical “play-of-color” phenomenon, the rainbow-like shimmer visible in Opal when light strikes it. The color and intensity of this play-of-color depend on the size and arrangement of these spheres.\nIn the case of boulder Opals from Australia’s Queensland, the fundamental formation process is the same, but the Opal settles in thin veins or cavities within iron-rich parent rock. The dark color and high iron content of the host rock often enhance the contrast and richness of the Opal’s color effects.\nLocalities\nQueensland is one of the key areas in Australia for boulder Opals. It spans the continent’s northeast, where much of the interior is arid or semi-arid land. This region hosts significant Opal-mining sites. The most famous places include Winton, Quilpie, Opalton, and Koroit, each of which significantly contributes to the global prestige of Australian Opals.\nHistory\nOpal mining in Queensland began around the turn of the 19th and 20th centuries, when adventurers and settlers sought new means of livelihood in the unforgiving landscape. Conditions here remain harsh—heat and drought affect mining work but also help preserve Opal deposits by minimizing damage from surface water. Many mines are still owned by small family businesses that rely on traditional techniques, supplemented by modern machinery.\nTypes of Australian Opals\nBlack OpalThe rarest and most valuable type of Opal, made famous by the Lightning Ridge deposit (New South Wales). It has a dark base color (black, gray, or dark blue), which emphasizes the play of color. Black Opals often display the most intense range of colors—red, green, blue, or purple.\nBoulder Opal ✓\nPrimarily mined in Queensland (northeastern Australia). It forms when Opal fills thin seams in ironstone or other types of parent rock (“boulder”). This type usually retains part of the original rock, creating a contrasting background. Boulder Opals can have a darker body tone, and thus can—like black Opals—exhibit a vibrant play of color.\nCrystal Opal Characterized by a translucent or transparent base. Sometimes it can be almost colorless in its uncut state, but the flashes of color shine through the crystal-clear or milky translucent base. Crystal Opals occur throughout Australia, though many come from Coober Pedy.\nWhite (Light) Opal This variety has a white to milky-white base color. It can display similarly vibrant colors to black Opal, but they tend to be less pronounced because the light background visually “mutes” the contrast. White Opal is most commonly found in Coober Pedy (South Australia) and is more affordable than black or boulder Opals.\nMatrix OpalA distinct variety in which Opal is dispersed within a porous host rock (such as sandstone or ironstone). After treatment (impregnation), the colors can become much more intense, as the darker background enhances the Opal’s play of color. Andamooka is especially famous for this type of matrix Opal, known as Andamooka Matrix, which can resemble rare black Opals from other localities once treated.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028011258181,"sku":"BO004","price":154.48,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/6435_boulder-opal-22ct---cabochon---queensland--australia_ca1ad58e-f088-4814-8928-3ed3e97b8c9f.jpg?v=1783985678"},{"product_id":"ethiopian-smoky-black-opal-cabochon-welo-ethiopia-okc001","title":"Ethiopian Smoky Black Opal – Cabochon – Welo, Ethiopia - OKC001","description":"\u003cul\u003e\n\u003cli\u003eLocation: Welo, Ethiopia\u003c\/li\u003e\n\u003cli\u003eWeight: 3g = 15.3ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 2.3 x 1.8 x 0.7 cm\u003c\/li\u003e\n\u003cli\u003eNote: These natural precious Opals have undergone smoke treatment, which gave them this attractive dark appearance that further enhances their play of color.\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eCabochons made from Ethiopian opals are particularly valued in the jewelry industry because this type of cut enhances the internal opalescent effects of the stone and contributes to greater overall stability.\nA cabochon cut has a domed and rounded top without facets, while the bottom is usually flat or slightly concave. This shape allows light to diffuse across the gently curved surface from multiple angles, effectively enhancing the opal's iridescent play of color and distributing it evenly. At the same time, the smooth, rounded edges protect the stone from mechanical damage, which is particularly important for opals due to their lower hardness. For hydrophane opals, this cut also offers a practical advantage—it helps to reduce internal tension in the stone, lowering the risk of fractures when the stone absorbs water.\nEthiopian cabochons display a wide range of colors—from clear, milky white, through yellow and orange tones, to intense red and green flashes. Many stones also show rare blue or purple play-of-color. Thanks to the cabochon shape, these colors flow smoothly across the domed surface.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028011323717,"sku":"OKC001","price":1938.45,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/6510_ethiopian-smoky-black-opal---cabochon---welo--ethiopia_b0fac1e0-6187-4df6-97f6-8121a6785c2d.jpg?v=1783985677"},{"product_id":"20-pcs-precious-opal-cabochons-welo-ethiopia-opk133-1","title":"20 pcs precious opal cabochons - Welo, Ethiopia - OPK133","description":"\u003cul\u003e\n\u003cli\u003eLocation: Welo, Ethiopia\u003c\/li\u003e\n\u003cli\u003eWeight: 15.7ct\u003c\/li\u003e\n\u003cli\u003eSize: approx. 7-9 mm\u003c\/li\u003e\n\u003cli\u003eNote: Box is included in the package\u003c\/li\u003e\n\u003cli\u003ePrice is for 20 pcs\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eEthiopian Opal Cabochons Ethiopian opal cabochons are among the most popular cuts in jewelry, as the cabochon cut strongly enhances the opalescent effects of the stone while also improving its mechanical stability. Thanks to this type of cut, the natural play of colors typical of Ethiopian opals is beautifully showcased. Characteristics of the cabochon cut The cabochon cut is characterized by a smooth, domed upper surface without facets, while the bottom of the stone is flat or slightly concave. This shape allows light to diffuse across the curved surface from many angles, effectively enhancing the iridescent play of colors and uniformly distributing the opalescent effects throughout the stone. Stability and protection of the opal The rounded edges of the cabochon protect the opal from mechanical damage, which is particularly important given its relatively low hardness. In the case of hydrophane Ethiopian opals, this shape also offers a practical advantage: it reduces internal stress and decreases the risk of cracks during water absorption. Color variability of Ethiopian opals Ethiopian opal cabochons display a wide range of colors, from light milky white shades to yellow and orange hues, with vibrant red and green flashes. Some specimens also exhibit rare blue or purple plays of color, which flow harmoniously over the domed surface thanks to the cabochon cut.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028011618629,"sku":"OPK133","price":309.61,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/70645_20-pcs-precious-opal-cabochons---welo--ethiopia_b0cd1ddd-519c-49e7-b982-ed53792f9af2.jpg?v=1783985712"},{"product_id":"indonesian-opal-114ct-cabochon-indonesia-io010","title":"Indonesian Opal 11.4ct – Cabochon – Indonesia - IO010","description":"\u003cul\u003e\n\u003cli\u003eLocation: Indonesia\u003c\/li\u003e\n\u003cli\u003eWeight: 2.2g = 11.4ct\u003c\/li\u003e\n\u003cli\u003eSize: 2.7 x 1.5 x 0.4 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIndonesian opals are mainly found on the islands of Java and Borneo, with smaller deposits also in Sumatra. Compared to the renowned Australian mining areas, these stones are less widespread. They are mostly of volcanic origin, formed where silica-rich solutions are deposited in rock fissures in regions of intense volcanic activity.\nTheir colors can range from milky white or grayish tones to dark, sometimes almost black, hues. Under certain lighting conditions, some specimens show a subtle iridescent play of colors. So-called \"wood opals,\" which form when ancient wood is permeated and fossilized, are also quite common. These often retain visible organic patterns from the original material.\nOpal mining in Indonesia is not as extensive as in some other countries, which partly explains the lower global awareness of these stones. Extraction is frequently carried out by hand, with minimal mechanization, and many specimens are subsequently cut and polished.\nIndonesian opals are primarily valued for their exotic origin. They are rarely exported in large quantities, making them a rare and sought-after addition to collectors' portfolios.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028013125957,"sku":"IO010","price":96.96,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/33281-6_photoroom-044-20250319-094525_cc7081fd-3c92-4cd7-98b5-3012495e595d.jpg?v=1783985647"},{"product_id":"indonesian-opal-327ct-cabochon-indonesia-io023","title":"Indonesian Opal 32.7ct – Cabochon – Indonesia - IO023","description":"\u003cul\u003e\n\u003cli\u003eLocation: Indonesia\u003c\/li\u003e\n\u003cli\u003eWeight: 6.5g = 32.7ct\u003c\/li\u003e\n\u003cli\u003eDimensions: 6.7 x 1.7 x 0.3 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIndonesian opals are mainly found on the islands of Java and Borneo, with smaller deposits also in Sumatra. Compared to the renowned Australian mining areas, these stones are less widespread. They are mostly of volcanic origin, formed where silicate-rich solutions are deposited in rock fissures in regions of intense volcanic activity.\nTheir colors can range from milky white or grayish tones to dark, sometimes almost black, shades. Under certain lighting conditions, some specimens show a subtle iridescent play of colors. So-called \"wood opals\", which form when ancient wood is permeated and fossilized, are also quite common. These often retain visible organic patterns from the original material.\nOpal extraction in Indonesia is not as extensive as in some other countries, which partly explains the lower global awareness of these stones. Extraction is frequently done by hand, with minimal mechanization, and many specimens are subsequently cut and polished.\nIndonesian opals are primarily valued for their exotic origin. They are rarely exported in large quantities, which makes them a rare and sought-after addition to collectors' portfolios.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028013224261,"sku":"IO023","price":226.23,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/38492-6_photoroom-019-20250319-095810_02ede92d-d861-4d08-859c-01a6cc12e450.jpg?v=1783985647"},{"product_id":"indonesian-opal-108ct-cabochon-indonesia-io032","title":"Indonesian Opal 10.8ct – Cabochon – Indonesia - IO032","description":"\u003cul\u003e\n\u003cli\u003eLocation: Indonesia\u003c\/li\u003e\n\u003cli\u003eWeight: 2.1g = 10.8ct\u003c\/li\u003e\n\u003cli\u003eSize: 2.1 x 1.3 x 0.5 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIndonesian opals are primarily found on the islands of Java and Borneo, with smaller deposits also in Sumatra. Compared to the renowned Australian mining areas, these stones are less common. They are mostly of volcanic origin, formed where silica-rich solutions deposit in rock fissures in regions of intense volcanic activity.\nTheir colors can range from milky white or grayish tones to dark, sometimes almost black, hues. Under certain lighting conditions, some specimens display a subtle iridescent play of colors. So-called \"wood opals,\" which form when ancient wood is permeated and fossilized, are also quite common. These often retain visible organic patterns from the original material.\nOpal mining in Indonesia is not as extensive as in some other countries, which partly explains the lower global awareness of these stones. Mining is frequently done by hand, with minimal mechanization, and many specimens are subsequently cut and polished.\nIndonesian opals are primarily valued for their exotic origin. They are rarely exported in large quantities, which makes them a rare and sought-after addition to collectors' portfolios.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028013257029,"sku":"IO032","price":96.96,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/40184_photoroom-000-20250324-130642_fbb66c48-11bb-459f-85b8-62d147dda090.jpg?v=1783985647"},{"product_id":"indonesian-opal-315ct-cabochon-indonesia-io014","title":"Indonesian Opal 31.5ct – Cabochon – Indonesia - IO014","description":"\u003cul\u003e\n\u003cli\u003eLocation: Indonesia\u003c\/li\u003e\n\u003cli\u003eWeight: 6.3g = 31.5ct\u003c\/li\u003e\n\u003cli\u003eSize: 6.5 x 1.5 x 0.3 cm\u003c\/li\u003e\n\u003cli\u003eDETAILED DESCRIPTION\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIndonesian opals are mainly found on the islands of Java and Borneo, with smaller deposits also in Sumatra. Compared to the renowned Australian mining areas, these stones are less widespread. They are mostly of volcanic origin, formed where silicate-rich solutions deposit in rock fissures in regions of intense volcanic activity.\nTheir colors can range from milky white or grayish tones to dark, sometimes almost black, hues. Under certain lighting conditions, some specimens show a subtle iridescent play of colors. So-called \"wood opals,\" which form when ancient wood is permeated and fossilized, are also quite common. These often retain visible organic patterns from the original material.\nOpal mining in Indonesia is not as extensive as in some other countries, which partly explains the lower global awareness of these stones. Mining is frequently done by hand, with minimal mechanization, and many specimens are subsequently cut and polished.\nIndonesian opals are mainly valued for their exotic origin. They are rarely exported in large quantities, making them a rare and sought-after addition to collectors' portfolios.\u003c\/p\u003e","brand":"PeltramMinerals","offers":[{"title":"Default Title","offer_id":58028013289797,"sku":"IO014","price":161.6,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0881\/1659\/2965\/files\/33293-7_photoroom-015-20250319-094741_839a861c-7478-4f0b-a6d3-ad3a2d49a539.jpg?v=1783985643"}],"url":"https:\/\/moldavite.it\/en\/collections\/minerali-lavorati.oembed?page=29","provider":"Moldavite.it","version":"1.0","type":"link"}