gemstone

Blue sapphire ring

Corundum, aluminum oxide (Al₂O₃), blue variety colored mainly by iron and titanium

AI-generated identification · may be incorrect

Sapphire has Mohs hardness 9, vitreous luster, hexagonal crystal structure, and typically strong blue color; the surrounding stones appear to be diamonds or diamond-like simulants. The image shows a mounted, faceted gemstone, so cleavage and specific gravity cannot be assessed visually.

Identified August 11, 2026More gemstone →

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Physical properties

Formation & geological history

Natural sapphires crystallize in igneous or metamorphic rocks and may later accumulate in alluvial deposits; major sources include Sri Lanka, Kashmir, Myanmar, Madagascar, and Australia. Most gem-quality stones formed millions to billions of years ago.

Uses & applications

Used primarily in jewelry and also in scratch-resistant windows, bearings, and watch crystals. Value depends heavily on natural versus synthetic origin, treatment, color, clarity, carat weight, and provenance.

Geological facts

Blue sapphire is the birthstone for September and a variety of corundum; ruby is the red variety. Kashmir-type vivid velvety blue is especially prized.

Field identification & locations

Identify by exceptional hardness, blue color, faceting, and possible inclusions; laboratory testing is required to distinguish natural, synthetic, and treated sapphire. A ring cannot be reliably identified from the photograph alone.