gemstone
Ruby
Corundum (Al2O3:Cr)
AI-generated identification · may be incorrectHardness of 9 on the Mohs scale, deep red to pinkish-red color, adamantine to vitreous luster, trigonal crystal system, and absence of cleavage with conchoidal fracture.
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Physical properties
Hardness of 9 on the Mohs scale, deep red to pinkish-red color, adamantine to vitreous luster, trigonal crystal system, and absence of cleavage with conchoidal fracture.
Formation & geological history
Forms in metamorphic and igneous environments, typically within marble, basalt, or gneiss, through high-temperature regional or contact metamorphism over millions of years.
Uses & applications
Extensively used in fine jewelry settings, luxury watches, and historical industrial applications like laser components.
Geological facts
Ruby is the red variety of corundum; blue varieties are known as sapphires. Trace amounts of chromium give ruby its signature vibrant red fluorescence and color.
Field identification & locations
Identified by its extreme hardness, high specific gravity, and distinctive red hue. Commonly sourced from Myanmar, Thailand, Mozambique, and Madagascar.
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