A visit to most state parks includes a hike or a bit of fly fishing. But Crater of Diamonds State Park brings something different to the table: some serious bling. Located about 115 miles southwest of Little Rock on the site of a volcanic crater, the park is a hotbed of buried diamonds crystallized from carbon, which formed in the earth’s mantle billions of years ago and were thrust to the surface by the crater’s explosion. In June 2015, one lucky visitor unearthed an 8.52-carat diamond—the fifth largest specimen found at the park since it opened in 1972—and the site regularly updates its list of record finds. Thanks to the mineral’s brilliant luster, a would-be diamond hunter’s best tool is often their own eyes, and it’s not uncommon to find diamonds glistening in the soil.