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Ruby is red-colored Corundum that gets its color from chromium. It can also show many other colors, as it exists with scores of minerals like Apatite, Pyrite, Muscovite, Kyanite, Painite, and Calcite, to name a few. Natural Rubies have a vitreous, resinous, or subadamantine luster. They’re usually transparent or translucent but may be opaque.
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