Crossword Genius

Birthstone for the month of May (7)

Ross

I believe the answer is:

emerald

(Other definitions for emerald that I've seen before include "Highly-valued variety of beryl" , "Ireland is often called The .......Isle" , "On of the Greens" , "a type employed by the press" , "and 1 Across: Ireland" .)

I've seen this clue in The Sunday Times and The Times.
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