OPALINE
| Date | Clue |
|---|---|
| 2026-05-23 | Milky and iridescent |
| 2010-10-23 | Like a moonstone |
| 2010-10-01 | Iridescent |
| 2008-10-17 | Milky and iridescent |
| 2004-06-13 | Iridescent |
| 2004-01-25 | Like a certain birthstone |
| 2002-05-04 | Iridescent |
| 2000-08-04 | Like moonstones |
| 2000-03-04 | Having a range of colors |
| 1997-05-04 | Prismatic, as a stone |
| 1995-09-10 | Resembling a birthstone |
| 1994-07-08 | Iridescent |