Did you know that Arkansas is the only state in the U.S. to produce diamonds. If you are lucky you will find one. A guy found one last week that was 3 1/2 carats. Crater of Diamonds State park is about a hour south of Hot Springs. It was my boys dream day to be able to spend a couple of hours digging in the dirt. The didn't find any diamonds, but were sure as dirty as a pig who has rolled in the mud.