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 Ink Well xwords, the USA Today, the New York Times, The Sunday Times, the Wall Street Journal, the King Feature Syndicate, The Times and the Universal.

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