Did you know that the United States is the only country in the world where you can dig up a diamond and get to keep it? It’s true, and it all happens down in Arkansas. Diamonds are found in extinct volcanic pipes where they were formed over billions of years in a rock called kimberlite. In the southwest of Arkansas is the Crater of Diamonds State Park (craterofdiamondsstatepark.com) where there are nearly 40 acres where you can dig for diamonds and keep what you find. In 1924 the Uncle Sam Diamond weighing more than 40 carats was found there.