The history of Cullinan, the English Crown Jewels’ biggest rough diamond ever discovered
The largest diamond in the rough, weighing 3,106.75 carats, was discovered by the South African Premier mine’s superintendent in 1905 during a routine examination (621.35 g).
Changing over to King Edward VII
It was completed as a present to King Edward VII after many vicissitudes, and he cut it and selected the major stones to be a part of the English Crown Jewels.
Evan Smith’s (Gemological Institute of America) study
Chemical hints indicate that they developed between 360 km and 750 km below the surface.