The Crater of Diamonds State Park in Arkansas has the only active diamond mine in the United States and is the only one in the world open to the public. The park was the site of the 1924 discovery of the Uncle Sam diamond—at 40.23 carats, the largest diamond to be found in the country.

The Crater of Diamonds State Park in Arkansas has the only active diamond mine in the United States and is the only one in the world open to the public. The park was the site of the 1924 discovery of the Uncle Sam diamond—at 40.23 carats, the largest diamond to be found in the country.

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