December birthstone (9)

I believe the answer is:

turquoise

(Other definitions for turquoise that I've seen before include "Greenish-blue gem" , "Sort of blue" , "Shade of blue - gemstone" , "Greenish-blue stone" , "Birthstone for December" .)

I've seen this clue in the Wall Street Journal, The Sunday Times, the Universal, The Times, the Ink Well xwords, the King Feature Syndicate, the New York Times and the USA Today.

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