For the 65th Anniversary, it's #BlueSapphire (wait a minute, aren't Sapphires USUALLY Blue? ...) | #BlueSapphireAnniversary #BlueSapphireJubilee

... well, possibly--the word Sapphire actually means "Blue" at its base--but the #Corundum (aluminum oxide with trace amounts of iron, titanium, chromium, vanadium, magnesium, etc.) also occurs as #YellowSaphire, #PurpleSapphire, #OrangeSapphire, #GreenSapphire #PartiSapphire (sapphire that shows two or more colors).
By Chip Clark, Smithsonian staff - Museum of Natural History, Smithsonian Institution, Image Number: 95-40288 Catalog Number: G3703 and Gem Gallery, Public Domain, https://commons.wikimedia.org/w/index.php?curid=17325598

Corundum also comes in Red (though those are called Rubies) and Pink (only called Sapphires in certain locales).

I list 'all the material-anniversaries I can find' in a post linked through 'the hyperlinks' below; but first I want to teach you about those words. And I find you understand words better if you see 'the words at their base' (then going on to look at the words at those words' bases, then the words at those words' bases, etc.-etc. ad infinitum into their Foundation)

The word “Corundum” is built on ancient words that mean Ruby Sapphire (a material that can be a variety of Sapphire, Amethyst, Ruby or |Topaz; next to Diamond in hardness).

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