The Uncle Sam Diamond is a 40.23-carat white diamond that holds title as the largest diamond ever found in North America. It was discovered in Murfreesboro in 1924 at the site that later became Crater of Diamonds State Park (which was established in 1972).
The diamond was named after the person who found it, a miner named W.O. Basham, who went by the nickname "Uncle Sam." The rough stone as originally discovered weighed 40.23 carats (8.046 g). It was faceted twice by Schenck & Van Haelen of New York, a company which specialized in Arkansas diamonds, handling over 14,000. The final result was a 12.42-carat (2.484 g) emerald-cut gem.
North America’s largest diamond and more than 75,000 others have been found at Crater of Diamonds State Park since diamonds were first discovered there in 1906. The park is located two miles southeast of downtown Murfreesboro at 209 State Park Road. For more details you can visit craterofdiamondsstatepark.com or call 870-285-3113.