Corundum
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Physical & Optical Properties
Mohs Hardness
Crystal System
Value & Market
Where to Buy Corundum
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About Corundum
Corundum is aluminum oxide—one of the hardest minerals on Earth at 9 Mohs—and encompasses two of the world's most prized gemstones: ruby (red) and sapphire (all other colors). Found in metamorphic rocks, pegmatites, and alluvial gravels across Madagascar, Myanmar, Sri Lanka, Thailand, and East Africa, corundum is remarkable for its hardness, brilliance, and wide color range. Gem-quality corundum commands among the highest per-carat prices in the colored gemstone market.
Jewelry Use
Suitable for daily wear