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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 Uncle Sam Diamond. This 40.23-carat, white diamond is the biggest diamond found in the United States. Discovered here in 1924, it was named the Uncle Sam diamond. Legend has it that the diamond was named after its finder, W.O. Basham, who went by the nickname, Uncle Sam. Over the years it was cut twice.