Cullinan, South Africa - Wikipedia
File:Cullinan Diamond.jpg - Wikipedia
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January 26, 1905: The Cullinan Diamond, a 3,106-Carat Diamond Found in South Africa
Cullinan (diamant) - Wikipedia
I found this an informative photo of the British Imperial State Crown : r/coolguides
Cullinan Diamond — A Reena Ahluwalia Blog — REENA AHLUWALIA