gemstone

Amethyst bead bracelet

Amethyst, purple quartz (SiO₂), with likely dyed or heat-treated agate/carnelian beads

AI-generated identification · may be incorrect

Quartz has Mohs hardness 7, vitreous luster, trigonal crystal structure, and no cleavage; purple color comes from iron-related defects and irradiation. The orange-red beads appear translucent chalcedony/agate, possibly enhanced by dye or heat treatment.

Identified August 15, 2026More gemstone →

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Physical properties

Formation & geological history

Amethyst forms in silica-rich volcanic cavities, especially in basaltic geodes, through hydrothermal fluids; many deposits are Jurassic to Cenozoic in age. Chalcedony forms from low-temperature silica-rich groundwater in cavities and fractures.

Uses & applications

Used extensively in jewelry, beads, carvings, and mineral collecting; agate and carnelian are also used for ornaments and lapidary work. Common commercial bracelets typically have modest value.

Geological facts

Amethyst is the purple variety of quartz and is February’s birthstone. Color can fade with prolonged heat or strong sunlight; vivid, even color may indicate treatment.

Field identification & locations

Identify amethyst by purple transparent-to-translucent quartz, hardness sufficient to scratch glass, and commonly uneven color zoning; chalcedony feels waxy and lacks visible crystals. Common sources include Brazil, Uruguay, Zambia, and Madagascar.