gemstone
Ruby
Corundum (Al2O3:Cr)
AI-generated identification · may be incorrectHardness of 9 on the Mohs scale, deep red color due to chromium, vitreous to subadamantine luster, and trigonal crystal system.
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Physical properties
Hardness of 9 on the Mohs scale, deep red color due to chromium, vitreous to subadamantine luster, and trigonal crystal system.
Formation & geological history
Formed in metamorphic and igneous rocks, specifically marbles and aluminum-rich pegmatites, over millions of years.
Uses & applications
Primarily used in high-end jewelry, luxury timepieces, and historically in laser technology.
Geological facts
Ruby is one of the traditional cardinal gemstones, with high-quality specimens commanding higher per-carat prices than diamonds.
Field identification & locations
Identified by its extreme hardness, characteristic red fluorescence under UV light, and specific gravity around 4.0.
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