gemstone

White cabochon gemstone, likely agate or chalcedony

Cryptocrystalline quartz (SiO₂), probably chalcedony/agate; exact identification is uncertain from the overexposed image

AI-generated identification · may be incorrect

Smooth polished oval cabochon in a metal setting; white to pale translucent appearance with waxy-to-glassy luster. Quartz hardness is about 6.5–7 Mohs, with no visible cleavage and specific gravity near 2.6.

Identified September 17, 2026More gemstone →

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At a glance

Common name: White cabochon gemstone, likely agate or chalcedony
Scientific name: Cryptocrystalline quartz (SiO₂), probably chalcedony/agate; exact identification is uncertain from the overexposed image
Category: gemstone
Identified: September 17, 2026
Method: Standard

AI Estimated Value

About $10–$50 for a common mounted cabochon; $50–$200+ if it proves to be high-quality natural agate or a valuable gemstone.

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

Chalcedony and agate form when silica-rich groundwater fills cavities in volcanic rocks, commonly during the Cenozoic or older. The pictured item appears cut and mounted as jewelry rather than naturally exposed.

Uses & applications

Used for rings, cabochons, ornaments, and collector specimens; relatively common material generally has modest commercial value.

Geological facts

The bright center is strongly overexposed, hiding possible banding or inclusions. It could also be white quartz, moonstone, synthetic material, or another pale gemstone; photography alone cannot confirm it.

Field identification & locations

Inspect in diffuse daylight for banding, translucency, bubbles, and inclusions; a hardness, specific-gravity, refractive-index, or gemological test is needed. Agate/chalcedony is plausible in the Deccan-region geology near 14.7°N, 77.6°E, but the setting obscures the specimen.