Historical clue formulations

• May birthstone — 2026-09-08
• ___ City, nickname for Seattle — 2022-10-07
• Birthstone after diamond — 2022-09-24
• May birthstone — 2022-02-19
• Like the background of the "Wicked" poster — 2021-09-29
• Green hue — 2019-05-31
• Green rock — 2018-11-22
• ___ City (memorable film destination) — 2016-10-13
• ___ City, 1939 film locale — 2014-04-27
• Ring rock — 2010-01-21
• Valuable green stone — 2010-01-04
• May symbol — 2009-09-26
• Ireland's hue — 2009-07-06
• 55th-anniversary gift — 2007-06-21
• Rich green — 2006-11-19
• ___ City of book and film — 2006-03-03
• ___ City of story and film — 2003-10-25
• Kind of cut — 2003-03-22
• May birthstone — 1999-04-07
• May birthstone — 1998-10-18
• Deep green — 1998-07-30
• Tiny type size — 1997-02-16
• Beryl variety — 1996-05-11