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

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