RUBY

Red gem (4)

Solution has appeared in 3 crosswords (1 across and 2 down):

• Quick crossword No 16,301 — 2022-08-04 23:00:29
  20A: ___ Murray (cockney rhyming slang for curry) (4)
• Quick crossword No 16,109 — 2021-12-23 00:00:40
  3D: 40th wedding anniversary stone (4)
• Quick crossword No 15,690 — 2020-08-19 23:00:05
  6D: Red gem (4)