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(Minerals) a red transparent variety of spinel, used as a gemstone
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a deep red, transparent variety of spinel, used as a gem.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||ruby spinel - 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
rubicelle - a yellow or orange variety of ruby spinel
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