spinel ruby

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Noun1.spinel ruby - a spinel used as a gemstone (usually dark red)
spinel - a hard glassy mineral consisting of an oxide of magnesium and aluminum; occurs in various colors that are used as gemstones
almandine - a purple variety of the ruby spinel
balas, balas ruby - a pale rose-colored variety of the ruby spinel
rubicelle - a yellow or orange variety of ruby spinel
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