Sapphire is a gemstone variety of the mineral corundum, an aluminium oxide, when it is a color other than red or dark pink, in which case the gem would instead be called a ruby, considered to be a different gemstone. Trace amounts of other elements such as iron, titanium, or chromium can give corundum blue, yellow, pink, purple, orange, or greenish color. Pink-orange sapphires are also called padparadscha.
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sapphire A clear deep blue variety of corundum, valued as a precious stone.
