The Crater of Diamonds State Park, in Murfreesboro, Arkansas, is the world’s only diamond mine open to the public. Visitors get to go on a real-life treasure hunt and keep whatever they find!
According to park officials, over 600 diamonds of various colors and grades are found by visitors each year. Over 75,000 diamonds have been unearthed since the mine was discovered in 1906 – 19,000 of them since the mine became a state park in 1972.
Scientists believe that these diamonds were formed three billion years ago in the earth’s mantle, 60 to 100 miles below the earth’s surface. The precious rocks were brought up to the surface about 100 million years ago, by a rising column of magma. A huge volcanic eruption resulted in an 80-acer crater, filled with fragments of mantle rock that contained diamonds. Over the years, the rocks have eroded, leaving the diamonds and other semi-precious gems loose in the soil.