Crossword Genius

Black gem (4)

Ross

I believe the answer is:

onyx

'black gem' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for onyx that I've seen before include "Semi-precious stone used in making cameos" , "Stones" , "Kind of agate" , "Cameo material" , "Form of agate" .)

I've seen this clue in the King Feature Syndicate, the Universal, The Washington Post, the Penny Press, the L.A. Times Daily, the Family Time and the USA Today.
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