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 L.A. Times Daily, the Universal, the Penny Press, the King Feature Syndicate, the Family Time, The Washington Post and the USA Today.
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