Uncle Sam (diamond)

Uncle Sam is the nickname for the largest diamond discovered in the United States. In 1924, W. O. Bassum discovered this pale brown diamond at Crater of Diamonds state park in Murfreesboro, Arkansas. The rough diamond originally discovered weighed 40.23 carats (8.046 g). It was cut twice, resulting in a final 12.42-carat (2.484 g) M-color, VVS1 clarity emerald-cut diamond. In 1971, the Uncle Sam was sold for $150,000.

Additional recommended knowledge

Safe Weighing Range Ensures Accurate Results

Essential Laboratory Skills Guide

How to quickly check pipettes?

See also

• Crater of Diamonds State Park

NAME YEAR FOUND ROUGH WEIGHT CUT WEIGHT COLOR

List of large US diamonds

• "Uncle Sam" 1924 40.23 carats 12.42 carats white
• "Amarillo Starlight" 1975 16.37 carats 7.54 carats white
• "Star of Arkansas" 1956 15.33 carats 8.27 carats white
• "Star of Shreveport" 1981 8.82 carats uncut white
• Lamle diamond 1978 8.61 carats brown
• Connell diamond 1986 7.95 carats white
• Dickinson/Stevens diamond 1998 7.28 carats uncut yellow
• Cooper diamond 1997 6.72 carats uncut brown
• "Gary Moore Diamond" 1960 6.43 carats uncut canary
• Lee diamond 1988 6.30 carats white
• Newman diamond 1981 6.25 carats white
• Fedzora diamond 1991 6.23 carats white

Stockton diamond 1981 6.20 carats white Schall diamond 1981 6.07 carats white Cooper diamond 1997 6.00 carats brown "Kahn Canary" 1977 4.25 carats uncut canary "Strawn-Wagner Diamond" 1990 3.03 carats 1.09 carats white