gemstone
Blue Sapphire
Corundum (Al2O3)
AI-generated identification · may be incorrectHardness of 9 on the Mohs scale, vitreous to adamantine luster, trigonal crystal system, and lack of cleavage with conchoidal fracture.
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Physical properties
Hardness of 9 on the Mohs scale, vitreous to adamantine luster, trigonal crystal system, and lack of cleavage with conchoidal fracture.
Formation & geological history
Forms in aluminum-rich metamorphic or igneous rocks like basalt and pegmatite under high temperatures and pressures.
Uses & applications
Extensively used in high-end fine jewelry, luxury timepieces, and industrial applications due to its extreme hardness.
Geological facts
Sapphire is the September birthstone and can occur in every color except red, which is classified as ruby.
Field identification & locations
Identified by its high specific gravity, extreme hardness, and lack of cleavage; major sources include Sri Lanka, Madagascar, and Kashmir.
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