“Black gemstone” crossword clue

Reveal the answer to see why it works and where this clue has appeared before.ONYX is the answer to the New York Times crossword clue “Black gemstone”. It was last seen in the puzzle of February 20, 2025, where it runs at 63 Across and fills 4 squares. It crosses 4 other entries in that grid — those are listed below and are the quickest way to confirm the letters you already have. This exact clue has run 2 times in NYT puzzles, first on February 20, 2025.