Historical clue formulations

• Multicolored gemstones — 2025-07-14
• Iridescent gemstones — 2025-07-02
• Iridescent gems — 2022-01-31
• Stones that diffract light — 2020-02-28
• Iridescent stones — 2020-02-27
• Precious collection of Queen Victoria — 2020-02-14
• Relatives of chalcedonies — 2019-11-16
• October birthstones — 2018-05-29
• Milky gems — 2017-06-11
• Crown insets — 2017-02-26
• October birthstones — 2017-01-23
• Precious Australian exports — 2016-07-10
• Gems with kaleidoscopic colors — 2016-02-02
• South Australian exports — 2014-07-24
• Milky gems — 2014-07-14
• Milky gems — 2012-01-11
• Birthstones whose name starts with the same letter as their month — 2011-07-17
• Gems from Australia — 2010-07-27
• Iridescent gems — 2009-08-10
• Australian export — 2008-12-20
• Export of 18-Across — 2008-11-27
• Pendant adornments — 2008-09-19
• Crown insets — 2007-07-15
• Iridescent gems — 2007-03-27
• Girasols — 2005-11-04
• Moonstones — 2005-04-17
• October birthstones — 2005-01-25
• Gifts on October birthdays — 2004-09-19
• October stones — 2002-06-04
• Milky gems — 2002-03-18
• Quartz varieties — 2001-12-19
• They're mined in Virgin Valley — 2001-11-16
• Milky gems — 2001-10-09
• Lustrous gems — 2000-03-27
• Australian export — 1997-05-28
• Stones for rings — 1996-08-16
• Gems — 1996-07-22
• Girasol and hyalite — 1996-07-10
• October birthstones — 1996-05-08
• Crown jewels — 1995-10-12
• October stones — 1995-01-02
• Fiery gems — 1994-09-19
• October gems — 1994-05-16