gemstone
Blue Sapphire
Corundum (Al2O3)
AI-generated identification · may be incorrectHardness of 9 on the Mohs scale, deep blue color, vitreous to adamantine luster, and hexagonal crystal system.
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Physical properties
Hardness of 9 on the Mohs scale, deep blue color, vitreous to adamantine luster, and hexagonal crystal system.
Formation & geological history
Forms in aluminum-rich metamorphic or igneous rocks like pegmatites and marbles over millions of years.
Uses & applications
Extensively used in high-end jewelry, watch bearings, and scientific instrumentation.
Geological facts
Sapphire is the September birthstone and is prized for its exceptional durability and rich color.
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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