Historical clue formulations

• Gem mined in Australia — 2026-03-16
• Gem with a "black" variety — 2025-11-15
• Gem that's much mined in Australia — 2025-09-23
• Iridescent stone — 2025-09-08
• October birthstone — 2025-08-24
• Gemstone found in hot springs — 2025-08-07
• Milky resource found in the outback — 2025-06-06
• Gem sometimes confused with a moonstone — 2025-04-20
• Fitting name for a girl born in October — 2025-04-11
• Iridescent stone — 2025-02-05
• ___ Lee, activist who led the movement to make Juneteenth a federal holiday — 2024-11-16
• Iridescent gem — 2024-11-12
• Birthstone for a Halloween baby — 2024-11-04
• Birthstone that begins with the same letter as its month — 2024-10-26
• Iridescent gem — 2024-10-21
• What the ancient Romans called the "Cupid stone," considering it a symbol of love — 2024-09-14
• "Because of Winn-Dixie" narrator — 2024-07-12
• Gemstone with a "fire" variety — 2024-06-10
• The gemstone Olympic Australis, for one — 2024-06-04
• The Australia-shaped "Pride of Australia," for one — 2024-03-24
• October birthstone — 2024-01-16
• Iridescent gem — 2023-12-19
• Gem whose name comes from "upala," the Sanskrit word for "precious stone" — 2023-12-11
• Gemstone with a "fire" variety — 2023-10-23
• October birthstone — 2023-10-17
• Fiery gem — 2023-05-16
• October birthstone — 2023-03-01
• Milky gemstone — 2023-01-08
• Gem mined in Australia — 2022-11-28
• Gemstone that can come from petrified wood — 2022-11-23
• Birthstone for most Libras — 2022-09-26
• Pick for a pendant — 2022-08-11
• Stone with silica — 2022-08-04
• Olympic Australis is a noted one — 2022-06-03
• Milky gem — 2022-04-19
• Iridescent gem — 2021-11-22
• October birthstone — 2021-10-19
• Tometi who co-founded Black Lives Matter — 2021-09-26
• ___ glass (translucent ornamental material) — 2021-09-08
• Gem that's a woman's name — 2021-07-28
• Birthstone for Hillary Clinton, Kamala Harris and Alexandria Ocasio-Cortez — 2021-05-23
• October birthstone — 2020-12-01
• White gemstone — 2020-11-23
• Gem that's also a name — 2020-09-20
• Birthstone for many Libras — 2020-09-08
• The Olympic Australis is the world's largest discovered one — 2020-08-07
• ___ Tometi, activist who co-founded Black Lives Matter — 2020-07-08
• Gem found in the Outback — 2020-07-06
• Gem with a play of colors — 2020-06-22
• Down Under gemstone — 2020-06-01