• Location: Namibia
• Weight: 6.6g
• Dimensions: 3.9 x 2 x 0.5 cm
• DETAILED DESCRIPTION

Zoned amethyst – quartz with characteristic banded structure

Zoned amethyst is a variety of amethyst characterized by alternating color zones within a single crystal. The typical combination of purple, transparent, or milky bands forms due to variations in conditions during crystal growth. These zones can be subtle or highly contrasting, creating a distinctive banded pattern.

Appearance and processing

Zoned amethyst is often cut into cabochons or faceted stones; the type of cut influences the final appearance of the pattern. In cabochons, soft color transitions stand out, while faceted stones emphasize the contrast between different zones. Each piece is unique due to its internal structure.

Formation of zoned amethyst

Amethyst forms through crystallization from mineral solutions within rock cavities. The zonal structure develops due to fluctuations in chemical conditions, particularly iron content and radiation intensity during crystal growth. These changes are recorded in the mineral structure as individual color layers.

Amethyst deposits

Zoned amethysts are found in many locations around the world, especially in Brazil, Uruguay, Namibia, Russia, and Madagascar. Each location produces material with different types of banding and color intensity.

Properties and characteristics

Zoned amethyst has a hardness of 7 on the Mohs scale, is transparent to translucent, and exhibits a vitreous luster. Its typical characteristic is the internal zoning, which influences both its appearance and how it is processed. Due to its durability, it is suitable for use in jewelry.