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

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