Rock Identifier
Faceted blue gemstone, likely blue sapphire (Corundum (Al₂O₃); identification from the image is provisional) — gemstone
gemstone

Faceted blue gemstone, likely blue sapphire

Corundum (Al₂O₃); identification from the image is provisional

AI-generated identification · may be incorrect

A small transparent-to-translucent oval faceted stone, appearing blue with a gray-blue center. Sapphire has Mohs hardness 9, vitreous luster, and a trigonal crystal structure; the visible color and facets alone cannot confirm it is natural sapphire rather than another gem or imitation.

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Physical properties

A small transparent-to-translucent oval faceted stone, appearing blue with a gray-blue center. Sapphire has Mohs hardness 9, vitreous luster, and a trigonal crystal structure; the visible color and facets alone cannot confirm it is natural sapphire rather than another gem or imitation.

Formation & geological history

Natural sapphire forms as corundum in metamorphic rocks or some igneous deposits; geological ages vary by deposit. The image does not establish whether this stone is natural, synthetic, treated, or imitation.

Uses & applications

Used in jewelry and, due to its hardness, in some technical applications.

Geological facts

Blue sapphire color is commonly caused by trace iron and titanium; gem treatments are widespread.

Field identification & locations

Confirm with gemological tests such as refractive index and magnification; common sources include Sri Lanka, Myanmar, Madagascar, and Australia.

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