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 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 luster, and trigonal crystal system.
Formation & geological history
Forms within metamorphic or igneous rocks like basalt under high-pressure, aluminum-rich environments over millions of years.
Uses & applications
Primarily used in high-end fine jewelry, luxury watches, and industrial scientific instruments.
Geological facts
Sapphire is the September birthstone and features prominently in historic royal engagement rings, such as that of Princess Diana.
Field identification & locations
Identified by its extreme hardness, high specific gravity, and distinctive hexagonal growth zoning or inclusions when examined closely.
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