gemstone
Red gemstone, likely ruby
Corundum (Al₂O₃), colored red by chromium
AI-generated identification · may be incorrectMohs hardness 9; vivid red, vitreous luster, trigonal crystal structure, no distinct cleavage. The image shows a faceted cut stone, so natural color and inclusions cannot be confirmed visually.
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Physical properties
Mohs hardness 9; vivid red, vitreous luster, trigonal crystal structure, no distinct cleavage. The image shows a faceted cut stone, so natural color and inclusions cannot be confirmed visually.
Formation & geological history
Ruby forms in aluminum-rich, silica-poor metamorphic rocks and some basalt-related deposits; geological ages vary widely, often tens to hundreds of millions of years.
Uses & applications
Used in fine jewelry and, synthetically, in lasers, watches, and precision components.
Geological facts
Ruby and sapphire are varieties of the same mineral, corundum; red coloration distinguishes ruby.
Field identification & locations
Natural ruby sources include Myanmar, Mozambique, Thailand, Sri Lanka, and Madagascar. Identification requires gemological testing; red spinel and glass are common lookalikes.
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