gemstone

Amethyst and smoky quartz jewelry

Amethyst: purple quartz, SiO₂; likely smoky quartz: irradiated/naturally colored quartz, SiO₂

AI-generated identification · may be incorrect

Hardness 7 Mohs; vitreous luster, trigonal crystal structure, no cleavage, conchoidal fracture, specific gravity about 2.65. The upper stone is transparent purple amethyst; the central gray-brown faceted stone is likely smoky quartz, while the dark cabochons may be onyx or other opaque stones.

Identified August 16, 2026More gemstone →

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At a glance

Common name: Amethyst and smoky quartz jewelry
Scientific name: Amethyst: purple quartz, SiO₂; likely smoky quartz: irradiated/naturally colored quartz, SiO₂
Category: gemstone
Identified: August 16, 2026
Method: Standard

AI Estimated Value

Approximately $20–$200 for these likely commercial jewelry pieces; exceptional natural stones or precious-metal settings may exceed $500.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, commonly in volcanic geodes and cavities; amethyst coloration comes mainly from iron and irradiation. Quartz deposits range from Precambrian to recent, and the jewelry settings are human-processed.

Uses & applications

Used extensively in jewelry, ornaments, and collector specimens; quartz also has major industrial uses in glass, electronics, abrasives, and engineered stone.

Geological facts

Amethyst’s purple color can fade with prolonged strong heat or sunlight. Faceting maximizes brilliance, while cabochon cutting is common for opaque or heavily included material.

Field identification & locations

Identify amethyst by purple color, glassy luster, hardness, and lack of cleavage; smoky quartz is gray-brown and remains quartz-hard. Common sources include Brazil, Uruguay, Zambia, Bolivia, and the United States.