gemstone
Ruby
Corundum (Al2O3)
AI-generated identification · may be incorrectHardness of 9 on the Mohs scale, vibrant pink to deep red color, vitreous to adamantine luster, and hexagonal crystal system.
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Physical properties
Hardness of 9 on the Mohs scale, vibrant pink to deep red color, vitreous to adamantine luster, and hexagonal crystal system.
Formation & geological history
Forms within metamorphic and igneous rocks, particularly in marble and basaltic terranes, over millions of years.
Uses & applications
Extensively used in high-end jewelry, watchmaking bearings, and lasers.
Geological facts
Ruby is one of the traditional cardinal gemstones, highly prized for its rich red hue caused by chromium impurities.
Field identification & locations
Identified by its extreme hardness, red fluorescence under UV light, and distinctive crystal habit; commonly sourced from Myanmar, Thailand, and East Africa.
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