gemstone
Faceted red ruby
Corundum (Al₂O₃), colored red by chromium
AI-generated identification · may be incorrectMohs hardness 9; vivid red, vitreous luster, trigonal crystal structure, and no true cleavage. The photo shows a faceted cut stone; its natural or synthetic origin cannot be determined visually.
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Physical properties
Mohs hardness 9; vivid red, vitreous luster, trigonal crystal structure, and no true cleavage. The photo shows a faceted cut stone; its natural or synthetic origin cannot be determined visually.
Formation & geological history
Natural ruby forms during metamorphism or in certain igneous-related deposits; ruby-bearing rocks range widely in age. Synthetic ruby is also produced industrially.
Uses & applications
Used in jewelry and collecting; corundum also has industrial uses as an abrasive and in specialized components.
Geological facts
Ruby and sapphire are varieties of the same mineral, corundum; red coloration distinguishes ruby.
Field identification & locations
Check for inclusions and natural growth features, but laboratory testing is needed to establish identity, treatments, and natural versus synthetic origin. Notable sources include Myanmar, Mozambique, Sri Lanka, and Thailand.
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