gemstone

Polished amethyst bead fragments

Amethyst, purple quartz (SiO₂)

AI-generated identification · may be incorrect

Mohs hardness 7; purple to reddish-brown color, vitreous luster, and trigonal crystal structure. The beads are polished and perforated, with visible color zoning and occasional surface inclusions; cleavage is absent, and specific gravity is about 2.65.

Identified August 22, 2026More gemstone →

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Physical properties

Formation & geological history

Amethyst forms when trace iron-bearing quartz crystallizes in gas cavities and fractures of volcanic rocks, commonly basalt; irradiation and later heating create its purple color. Most commercial material comes from Brazil, Uruguay, Zambia, and Bolivia, formed largely in Mesozoic volcanic settings.

Uses & applications

Used for jewelry, prayer beads, carvings, and ornamental objects; these appear to be drilled, polished beads rather than natural crystal specimens. Typical value is about $1–$8 per bead, or $15–$80 for a strand, depending on color, clarity, size, and origin.

Geological facts

The beads’ spherical shape and holes indicate human processing, which still qualifies them as geological specimens because they are made from natural quartz. Strong purple color generally increases value, while brownish or pale material is more common.

Field identification & locations

Identify amethyst by its purple quartz composition, glassy luster, hardness, and lack of cleavage; it should scratch glass but not be scratched by a steel knife. Estimated market value: $10–$100 for this mixed lot; verify with a refractometer or gem lab if high value is suspected.