gemstone

Blue faceted gemstone, likely synthetic sapphire or blue glass

Corundum (Al₂O₃) if sapphire; identity cannot be confirmed visually

AI-generated identification · may be incorrect

Deep blue, transparent-to-translucent, vitreous luster, sharply faceted and polished; sapphire hardness is Mohs 9, while glass is about 5–6. The elongated shape and visible internal line may indicate a cut fragment or synthetic material.

Identified September 9, 2026More gemstone →

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At a glance

Common name: Blue faceted gemstone, likely synthetic sapphire or blue glass
Scientific name: Corundum (Al₂O₃) if sapphire; identity cannot be confirmed visually
Category: gemstone
Identified: September 9, 2026
Method: Standard

AI Estimated Value

As pictured and untested: about $1–$20; confirmed natural blue sapphire could range from $50 to thousands per carat, depending on color, clarity, treatment, and size.

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 blue sapphire forms in aluminum-rich metamorphic or igneous rocks, commonly in marble, basalt, and placer deposits; geological ages vary widely. Synthetic sapphire is laboratory-grown, while blue glass is human-made.

Uses & applications

Blue sapphire is used in jewelry, watch crystals, and industrial windows; synthetic sapphire has extensive optical and technological uses. Glass has mainly decorative value.

Geological facts

Blue color in sapphire commonly comes from iron and titanium; strong pleochroism and a refractive index around 1.76–1.77 help distinguish it from glass.

Field identification & locations

Possible indicators include exceptional scratch resistance, doubling of facet edges under magnification, curved growth lines in synthetic sapphire, and gas bubbles in glass; gemological testing is required. Common natural sources include Sri Lanka, Myanmar, Kashmir, Madagascar, and Australia.