gemstone
Blue Sapphire
Corundum (Al2O3)
AI-generated identification · may be incorrectHardness of 9 on the Mohs scale, deep blue color, vitreous to adamantine luster, trigonal crystal system, and a specific gravity of 4.0.
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Physical properties
Hardness of 9 on the Mohs scale, deep blue color, vitreous to adamantine luster, trigonal crystal system, and a specific gravity of 4.0.
Formation & geological history
Forms in aluminum-rich metamorphic or igneous rocks like pegmatites and marbles under high pressure and temperature.
Uses & applications
Used extensively in high-end fine jewelry, luxury watches, and precision industrial bearings.
Geological facts
Sapphire is the September birthstone and is second only to moissanite and diamond in mineral hardness.
Field identification & locations
Identified by its extreme hardness, high density, and lack of cleavage; commonly sourced from Sri Lanka, Madagascar, and Myanmar.
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