gemstone

Colorless cut gemstone, likely white sapphire

Corundum (Al₂O₃), tentatively identified; the image alone cannot confirm the stone

AI-generated identification · may be incorrect

Transparent, colorless, brilliant faceted appearance. If sapphire: Mohs hardness 9, vitreous luster, trigonal crystal structure, and no true cleavage; inclusions and facet wear can help distinguish it from diamond or glass.

Identified October 11, 2026More gemstone →

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Physical properties

Formation & geological history

Natural sapphire crystallizes in aluminum-rich, silica-poor metamorphic rocks or igneous deposits and may be concentrated in placer gravels; geological ages vary widely. The pictured stone has been cut and polished.

Uses & applications

Used in jewelry; synthetic colorless sapphire is also used for scratch-resistant watch faces and optical components.

Geological facts

Colorless sapphire is called white sapphire and is a durable diamond alternative, though it has less brilliance and dispersion than diamond.

Field identification & locations

Check with a jeweler or gemological lab: visual appearance is insufficient to distinguish white sapphire from diamond, zircon, moissanite, or glass. Natural sapphires occur in Sri Lanka, Madagascar, Myanmar, Australia, and other regions.