gemstone

Amethyst (polished bead)

Quartz, SiO₂; purple variety colored mainly by iron-related defects

AI-generated identification · may be incorrect

Mohs hardness 7; purple, vitreous luster, trigonal crystal structure, no cleavage and conchoidal fracture. The image shows a small polished, rounded purple bead; internal features are not clear enough to assess quality.

Identified October 8, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when silica-rich fluids deposit quartz in cavities and veins, commonly in volcanic rocks; purple color develops through trace iron and natural irradiation. Deposits span many geological ages.

Uses & applications

Used in jewelry, beads, carvings, and mineral collections.

Geological facts

Amethyst is the traditional February birthstone; heat treatment can turn it yellow or orange, resembling citrine.

Field identification & locations

Common sources include Brazil, Uruguay, Zambia, and Russia. Identify by its purple color, glassy luster, and hardness; a bead alone cannot confirm natural origin or treatment.