gemstone
Ruby (Corundum in Ring Setting)
Corundum (Al2O3:Cr)
AI-generated identification · may be incorrectHardness 9 on the Mohs scale, vitreous to adamantine luster, trigonal crystal system, vibrant red color, and specific gravity around 4.0.
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Physical properties
Hardness 9 on the Mohs scale, vitreous to adamantine luster, trigonal crystal system, vibrant red color, and specific gravity around 4.0.
Formation & geological history
Forms in metamorphic rocks (marble or mica schists) or contact metamorphic zones rich in aluminum and depleted in silica.
Uses & applications
Predominantly faceted or cabochon-cut for fine jewelry such as rings; also used synthetically in lasers and precision mechanics.
Geological facts
Trace amounts of chromium give ruby its distinct red fluorescence and hue, making it one of the traditional cardinal gems.
Field identification & locations
Identified by its high hardness, absence of true cleavage, and distinct red color; prominent natural sources include Myanmar, Madagascar, and Mozambique.
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