Crossword Genius

Black gem (4)

Ross

I believe the answer is:

onyx

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">black gem</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

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