gemstone

Cabochon gemstone ring, likely smoky quartz or tourmaline

Unconfirmed quartz (SiO₂) or brown tourmaline (dravite); visual identification is inconclusive

AI-generated identification · may be incorrect

Large polished oval cabochon, translucent dark brown to nearly black, with vitreous luster and internal reflections; cabochon cutting obscures crystal structure and cleavage. If quartz, hardness is Mohs 7 and specific gravity about 2.65; dravite is Mohs 7–7.5 and SG about 3.1–3.3.

Identified September 19, 2026More gemstone →

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At a glance

Common name: Cabochon gemstone ring, likely smoky quartz or tourmaline
Scientific name: Unconfirmed quartz (SiO₂) or brown tourmaline (dravite); visual identification is inconclusive
Category: gemstone
Identified: September 19, 2026
Method: Standard

AI Estimated Value

Approximately $10–$150 for a common imitation or low-grade stone in costume jewelry; potentially $100–$500+ if verified as a quality natural gemstone, excluding the ring’s metal value.

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

The gemstone is likely a natural mineral formed in hydrothermal veins or pegmatites, then cut and mounted in a gold-colored metal setting; geological age cannot be determined from the photograph.

Uses & applications

Used primarily in jewelry and collecting. The ornate setting appears gold-colored, but its metal composition cannot be established visually.

Geological facts

The stone shows no diagnostic banding, color zoning, or inclusions clear enough for confident species identification; it could also be another dark cabochon such as smoky quartz, garnet, or glass imitation.

Field identification & locations

Field identification requires testing: hardness, refractive index, specific gravity, and magnification. A jeweler or gem laboratory should test it; inspect for bubbles, scratches, and loupe-visible inclusions to distinguish glass from natural material.