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On the other hand, the size of a .5 carat diamond is approximately 5.2mm. Even though the carat weight is 50% of a 1 carat stone, it doesnât face up twice as small! Likewise, the physical size of a 2 carat diamond (8.2mm diameter) isnât twice as big as that of a 1 carat diamond (6.5mm diameter). Hopefully, this clears up the misunderstanding of carat weight and actual sizes.
The Cullinan diamond was found 18 feet (5.5 m) below the surface at Premier Mine in Cullinan, Transvaal Colony, by Frederick Wells, surface manager at the mine, on 26 January 1905. It was approximately 10.1 centimetres (4.0 in) long, 6.35 centimetres (2.50 in) wide, 5.9 centimetres (2.3 in) deep, and weighed 3,106 carats (621.2 grams).