I still recall using the 𝑆𝑜𝑢𝑡ℎ 𝐴𝑓𝑟𝑖𝑐𝑎𝑛 𝐺𝑒𝑚𝑠𝑡𝑜𝑛𝑒𝑠 phosphorescent airmail postcard stamp set (released in 2009): it included stamps of Sugilite, Garnet, Rodochrosite and Jasper.

"South Africa is famous for its diamonds. In fact, some of the most famous diamonds in the world were mined in South Africa. What’s even more incredible is that the world’s largest diamond ever found, which remains unchallenged up until today, The Cullinan Diamond, was unearthed here."

A 𝐹𝑎𝑚𝑜𝑢𝑠 𝐷𝑖𝑎𝑚𝑜𝑛𝑑𝑠 𝑜𝑓 𝑆𝑜𝑢𝑡ℎ 𝐴𝑓𝑟𝑖𝑐𝑎 airmail postcard stamp set was released in 2019. 🇿🇦💎

I abaolutely love gemstones, and would love to have these stamps. I would prefer a worldwide-available premium set, though. Something like the flower whispers series maybe?