Crossword Genius

Jet-black gem

Ross

I believe the answer is:

onyx

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

(Other definitions for onyx that I've seen before include "Form of agate" , "Mineral with coloured layers" , "Black variety of quartz" , "Agate with different bands of colour" , "Variety of agate, used as a gemstone" .)

I've seen this clue in The New York Times.
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