gemstone

Amethyst gemstone ring

Quartz, purple variety — SiO₂

AI-generated identification · may be incorrect

The faceted purple stone is likely amethyst, with Mohs hardness 7, vitreous luster, hexagonal crystal structure, and no prominent cleavage. Its color comes mainly from iron impurities and irradiation; the surrounding metal and setting are human-made, but the gemstone is geological material.

Identified August 18, 2026More gemstone →

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Physical properties

Formation & geological history

Amethyst forms in cavities of volcanic rocks, especially basalt, when silica-rich groundwater deposits quartz crystals over long periods, commonly during Mesozoic to younger geological episodes. Major sources include Brazil, Uruguay, Zambia, and Namibia.

Uses & applications

Used extensively in jewelry and ornamental objects; quartz is also important industrially in glass, electronics, and abrasives. Value depends on color saturation, transparency, cut, size, and treatment.

Geological facts

The strongest commercial color is often called “Deep Siberian,” though most modern material comes from South America and Africa. Heat treatment can alter purple amethyst into yellow citrine or green prasiolite.

Field identification & locations

Identify it by its purple color, glassy luster, hardness, and resistance to scratching by steel; natural amethyst commonly shows zoning or inclusions. This image cannot confirm authenticity or distinguish natural from synthetic material.