gemstone

Blue faceted gemstone, likely sapphire

Corundum (Al₂O₃), likely blue sapphire; identity cannot be confirmed from the photograph alone

AI-generated identification · may be incorrect

Vivid blue, transparent, faceted, vitreous-lustrous stone in a small multi-prong setting. Sapphire hardness is Mohs 9, trigonal crystal structure, no cleavage, and specific gravity about 4.0; inclusions and possible treatment are not visible.

Identified September 7, 2026More gemstone →

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At a glance

Common name: Blue faceted gemstone, likely sapphire
Scientific name: Corundum (Al₂O₃), likely blue sapphire; identity cannot be confirmed from the photograph alone
Category: gemstone
Identified: September 7, 2026
Method: Standard

AI Estimated Value

About $10–$100 if synthetic or imitation; roughly $50–$1,000+ for a small natural commercial sapphire, while fine untreated origin-certified stones can exceed $5,000.

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 sapphire forms in aluminum-rich metamorphic rocks or basalt-related deposits, commonly during older Precambrian to Mesozoic geological events; synthetic sapphire may be laboratory-grown. The apparent stone is cut and mounted, so geological age cannot be determined visually.

Uses & applications

Used extensively in rings and other jewelry, with synthetic sapphire also used for watch crystals, optical windows, and specialized industrial components.

Geological facts

Blue color is typically caused by iron and titanium. Similar-looking alternatives include blue spinel, iolite, tanzanite, glass, and synthetic corundum.

Field identification & locations

Confirm with refractive index, magnification, spectroscopy, and a gemological lab; do not scratch-test a mounted stone. Important sources include Kashmir, Sri Lanka, Myanmar, Madagascar, Australia, and Montana.