gemstone
Ruby
Corundum (Al2O3:Cr)
AI-generated identification · may be incorrectHardness of 9 on the Mohs scale, vivid red color due to chromium traces, vitreous to adamantine luster, trigonal crystal system, and no cleavage.
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Physical properties
Hardness of 9 on the Mohs scale, vivid red color due to chromium traces, vitreous to adamantine luster, trigonal crystal system, and no cleavage.
Formation & geological history
Formed in metamorphic and igneous environments under high temperature and pressure conditions, often found in marble deposits and alluvial gravels.
Uses & applications
Used extensively in high-end jewelry, watch bearings, and laser technology.
Geological facts
Ruby is one of the traditional cardinal gemstones and is rarer than diamond in large, flawless specimen qualities.
Field identification & locations
Identified by its extreme hardness, specific red fluorescence under UV light, and characteristic hexagonal crystal habit when rough.
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