• Location: Indonesia
• Weight: 0.9g = 4.5ct
• Dimensions: 1.5 x 1.2 x 0.3 cm
• DETAILED DESCRIPTION

Indonesian opals are primarily found on the islands of Java and Borneo, with smaller deposits also occurring on Sumatra. Compared to the renowned Australian mining areas, these stones are less widely known. They are mostly of volcanic origin, formed where silica-rich solutions deposit in rock fissures in regions of intense volcanic activity. Their colours can range from milky white or greyish tones to dark, sometimes almost black, hues. Under certain lighting conditions, some specimens display a subtle iridescent play of colours. 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. Opal 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. Indonesian 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.