Topaz or peridot, e.g. (3)

I believe the answer is:

gem

(Other definitions for gem that I've seen before include "Pleasant and cheerful (from German)" , "one of the Cairngorms?" , "Diamond, ruby, or emerald" , "Precious or semi-precious stone" , "Valued person; jewel" .)

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

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