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

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