gemstone
Blue Sapphire
Corundum (Al2O3)
AI-generated identification · may be incorrectHardness of 9 on the Mohs scale, deep blue color due to iron and titanium impurities, vitreous to adamantine luster, and trigonal crystal system.
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Physical properties
Hardness of 9 on the Mohs scale, deep blue color due to iron and titanium impurities, vitreous to adamantine luster, and trigonal crystal system.
Formation & geological history
Forms within metamorphic or igneous rocks, such as marble or basalt, typically during high-temperature regional or contact metamorphism.
Uses & applications
Extensively used in fine jewelry, watch components, and scientific instrumentation due to its extreme durability.
Geological facts
Sapphire is the September birthstone and is second only to moissanite and diamond in natural hardness.
Field identification & locations
Identified by its high density, conchoidal fracture, and extreme scratch resistance; found majorly in Sri Lanka, Madagascar, and Kashmir.
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