gemstone
Tumbled Ruby
Corundum (Al2O3:Cr)
Hardness: 9 on the Mohs scale, Color: Vivid red, Luster: Vitreous to subadamantine, Crystal Structure: Trigonal, Specific Gravity: 4.0
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Physical properties
Hardness: 9 on the Mohs scale, Color: Vivid red, Luster: Vitreous to subadamantine, Crystal Structure: Trigonal, Specific Gravity: 4.0
Formation & geological history
Formed in metamorphic or igneous rocks such as marbles, skarns, and basaltic terrains through regional or contact metamorphism of aluminum-rich rocks over millions of years.
Uses & applications
Used in fine jewelry, ornamental collections, watch bearings, and laser technology.
Geological facts
Ruby is one of the traditional cardinal gemstones, highly prized throughout history for its intense red color caused by trace amounts of chromium.
Field identification & locations
Identified by its exceptional hardness, high specific gravity, and deep red hue. Found in countries like Myanmar, Thailand, Sri Lanka, and East Africa.
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