Dark red stone (6)

I believe the answer is:

garnet

(Other definitions for garnet that I've seen before include "Hard glassy mineral used as a gemstone" , "Semi-precious stone of deep transparent red" , "Semi-precious stone of argent type" , "Deep red gem stone" , "Glassy red, yellow or green gemstone" .)

I've seen this clue in the Newsday.

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