Crossword Genius

Diamond, e.g. (3)

Ross

I believe the answer is:

gem

(Other definitions for gem that I've seen before include "one of the Cairngorms?" , "Kindness; comfort (German)" , "Precious or semi-precious stone" , "perfect specimen" , "Pleasant and cheerful (from German)" .)

I've seen this clue in The Wall Street Journal.
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