gemstone

Purple faceted gemstone, likely amethyst or synthetic colored corundum

Amethyst: quartz (SiO₂); possible alternative: purple corundum (Al₂O₃) or glass

AI-generated identification · may be incorrect

Small faceted, transparent-to-translucent purple stone with vitreous luster; amethyst has Mohs hardness 7, quartz crystal structure, and no cleavage. The image alone cannot confirm composition or natural origin.

Identified September 16, 2026More gemstone →

Explore Purple faceted gemstone, likely amethyst or synthetic colored corundum in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Purple faceted gemstone, likely amethyst or synthetic colored corundum
Scientific name: Amethyst: quartz (SiO₂); possible alternative: purple corundum (Al₂O₃) or glass
Category: gemstone
Identified: September 16, 2026
Method: Standard

AI Estimated Value

Approximately $5–$50 for a small commercial amethyst; $20–$200+ if unusually fine. Synthetic corundum or glass may be worth under $10.

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

Natural amethyst forms in silica-rich volcanic cavities, commonly during Permian–Cenozoic hydrothermal activity; faceting is human processing. Purple corundum or glass may be laboratory-produced.

Uses & applications

Used in jewelry and mineral collecting; faceted amethyst is generally affordable, while fine purple corundum can be substantially more valuable.

Geological facts

Amethyst’s purple color is caused mainly by iron-related defects and irradiation. Strong color zoning, inclusions, and refractive behavior help distinguish it from glass or synthetic stones.

Field identification & locations

Common amethyst sources include Brazil, Uruguay, Zambia, and Bolivia. Test with hardness, refractive index, and magnification; avoid scratching the stone, and note that a gemological instrument is needed for reliable identification.