The history of Cullinan, the English Crown Jewels’ biggest rough diamond ever discovered
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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
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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.
The origin
Evan Smith’s (Gemological Institute of America) study
Chemical hints indicate that they developed between 360 km and 750 km below the surface.