Oriental amethyst

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the violet-blue variety of transparent crystallized corundum or sapphire.

See also: Amethyst

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Sapphires that are not blue are sometimes described as "fancy", the yellow examples can also be called "oriental topaz" and the green and purple, "oriental emerald" or "oriental amethyst" respectively.