gemstone

Likely smoky quartz cabochon ring

Quartz, silicon dioxide (SiO₂), probably smoky quartz; visual identification is uncertain because the stone is mounted and reflective

AI-generated identification · may be incorrect

Dark brown-to-gray, transparent/translucent cabochon with vitreous luster and no visible crystal faces; quartz hardness is Mohs 7, with conchoidal fracture and specific gravity about 2.65. The surrounding metal and small accent stones are jewelry settings, not geological material.

Identified September 19, 2026More gemstone →

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At a glance

Common name: Likely smoky quartz cabochon ring
Scientific name: Quartz, silicon dioxide (SiO₂), probably smoky quartz; visual identification is uncertain because the stone is mounted and reflective
Category: gemstone
Identified: September 19, 2026
Method: Standard

AI Estimated Value

Approximately $10-$100 for ordinary smoky quartz jewelry; $100-$500+ if the setting is precious metal or the stone is unusually clear and well cut.

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

Smoky quartz forms when natural or irradiation-induced color centers develop in quartz, commonly in granitic pegmatites and hydrothermal veins; it may be millions to billions of years old. The cabochon has been cut and polished.

Uses & applications

Used as an ornamental gemstone in rings and pendants; quartz is also important industrially in glass, electronics, and abrasives.

Geological facts

The color can fade with strong heating or prolonged sunlight. Similar-looking stones include dark tourmaline, smoky glass, and treated quartz.

Field identification & locations

Check for natural inclusions, refractive behavior, and hardness, but do not scratch the mounted stone; gemological testing is needed for confirmation. Common sources include Brazil, Switzerland, Madagascar, and the United States.