What name was given to the largest diamond ever found in the US?
This diamond, called the Uncle Sam diamond, was found at the Crater of Diamonds State Park in Arkansas in 1924 and weighed in at a whopping 40.23 carats. It remains the largest diamond ever found in the United States.
There are two records for that: Centenary Diamond - world's largest colorless, flawless diamond and The Golden Jubilee Diamond - World's largest faceted diamond. These two are among the largest polished (finished) diamonds. The Cullinan diamond is the largest rough gem-quality ever found, at 3,106.75 carats.