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 Penny Press, the Family Time, the King Feature Syndicate, the USA Today, the Universal, the L.A. Times Daily and The Washington Post.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.