gemstone

Faceted purple gemstone, likely amethyst

Amethyst, purple variety of quartz (SiO₂)

AI-generated identification · may be incorrect

Mohs hardness 7; purple to violet, vitreous luster, trigonal crystal structure, and no true cleavage. The image shows a small faceted stone; color alone cannot confirm it is natural amethyst rather than treated quartz or synthetic material.

Identified October 7, 2026More gemstone →

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Physical properties

Formation & geological history

Amethyst forms when iron-bearing quartz crystallizes in cavities of volcanic rocks, with irradiation producing its purple color. Deposits range from geologically ancient to relatively young; the stone’s origin and age cannot be determined from the image.

Uses & applications

Used in jewelry, ornamental objects, and mineral collections; quartz also has industrial uses in electronics and glassmaking.

Geological facts

Amethyst is quartz colored by trace iron and natural irradiation; heating can turn it yellow or orange, producing citrine-like material.

Field identification & locations

Common sources include Brazil, Uruguay, Zambia, and Madagascar. Look for quartz-like hardness and natural color zoning; gemological testing is needed to distinguish natural, treated, and synthetic stones.