gemstone
Ruby (in a ring setting)
Corundum (Al2O3:Cr)
Hardness of 9 on the Mohs scale, deep red color due to chromium impurities, vitreous to adamantine luster, trigonal crystal system, no cleavage with conchoidal fracture, specific gravity around 4.02
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Physical properties
Hardness of 9 on the Mohs scale, deep red color due to chromium impurities, vitreous to adamantine luster, trigonal crystal system, no cleavage with conchoidal fracture, specific gravity around 4.02
Formation & geological history
Formed in metamorphic and igneous environments, typically within marble, gneiss, or basaltic alluvial deposits through regional or contact metamorphism over millions of years
Uses & applications
Used primarily as a precious gemstone in fine jewelry, as well as in laser technology and watch bearings
Geological facts
Ruby is one of the traditional cardinal gems. The most prized rubies originate from the Mogok Valley in Myanmar (Burma) and exhibit a coveted 'pigeon's blood' red hue
Field identification & locations
Identified by its extreme hardness, characteristic red fluorescence under ultraviolet light, and high density; commonly found in Myanmar, Thailand, Sri Lanka, and East Africa
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