| 2026-03-31 | Banded mineral seen at many a street fair |
| 2025-10-07 | Black gemstone |
| 2025-09-13 | Jet-black stone |
| 2025-07-22 | Jet-black stone |
| 2025-04-29 | Gemstone whose name comes from the Greek for "claw" |
| 2025-02-20 | Black gemstone |
| 2024-04-05 | It might make a cameo |
| 2024-03-09 | Gem used in intaglio |
| 2023-06-07 | Shade of black |
| 2022-11-12 | Variety of agate |
| 2022-10-28 | Type of chalcedony |
| 2022-10-05 | Deep black |
| 2022-06-30 | Mineral with parallel bands |
| 2022-02-22 | Shade of black |
| 2022-01-06 | Jet-black gem |
| 2021-12-12 | Rock with colorful bands |
| 2021-01-07 | Dark rock |
| 2020-10-15 | Traditional gemstone for a seventh wedding anniversary |
| 2020-01-20 | Black gem with bands |
| 2019-06-03 | Black, banded gemstone |
| 2019-04-15 | Black gemstone |
| 2019-03-17 | Inky stone |
| 2017-07-02 | Shade of black |
| 2016-12-12 | Black gemstone |
| 2016-01-10 | First gemstone mentioned in the Bible |
| 2015-12-01 | Cameo material |
| 2015-11-22 | Jet black |
| 2015-10-18 | Cameo stone |
| 2015-08-17 | Jet-black gem |
| 2015-08-16 | Black rock |
| 2015-04-17 | Black ring material |
| 2014-12-18 | Inky |
| 2014-08-14 | Material used in many high-end chess sets |
| 2014-04-02 | Cameo stone |
| 2014-03-02 | Jet black |
| 2013-11-18 | Cameo gem |
| 2013-11-15 | Jet black |
| 2013-04-14 | Panther figurine material |
| 2012-08-21 | Deep black gem |
| 2012-08-18 | Stone for a Cancer, traditionally |
| 2012-07-04 | Chalcedony variety |
| 2012-04-11 | Jet-black gem |
| 2011-05-26 | Black |
| 2011-04-22 | Black |
| 2011-02-13 | Jet black |
| 2010-11-10 | Cameo gem |
| 2010-09-27 | Gem with colored bands |
| 2010-02-09 | Common cameo stone |
| 2007-12-20 | Ornamental stone |
| 2007-03-17 | Cameo choice |
| 2006-05-02 | Stone used for chess sets |
| 2006-04-05 | Black stone |
| 2005-11-19 | It might make a cameo appearance |
| 2005-11-16 | Quartz type |
| 2004-10-27 | Cameo gem |
| 2004-09-29 | Cameo stone |
| 2004-07-16 | Black |
| 2004-07-04 | Black beauty |
| 2004-02-11 | Cameo stone |
| 2003-10-09 | Jet black |
| 2003-09-22 | Cameo stone |
| 2003-02-12 | Jet black |
| 2002-07-04 | Jet black |
| 2001-08-02 | Black as night |
| 2000-12-27 | Cameo stone |
| 2000-10-15 | Striped stone |
| 2000-02-20 | Jet black |
| 1999-12-22 | Cameo stone |
| 1998-08-11 | Cameo stone |
| 1997-10-28 | Cameo stone |
| 1997-01-22 | Kind of marble |
| 1996-06-12 | Shade of black |
| 1995-09-18 | Banded chalcedony |
| 1994-08-31 | Cameo stone |