“Gem that's much mined in Australia” crossword clue

Reveal the answer to see why it works and where this clue has appeared before.OPAL is the answer to the New York Times crossword clue “Gem that's much mined in Australia”. It was last seen in the puzzle of September 23, 2025, where it runs at 19 Down 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.