Arkansas State Parks Trip Ideas Filter Park Jacksonport Lake Catherine Lake Charles Lake Frierson Moro Bay White Oak Lake Withrow Springs [X] Crater of Diamonds [X] Pinnacle Mountain Region Central Southwest Park Activity Climbing Diamond Digging Hiking Watchable Wildlife Trail Type [X] Day Hikes Trail Difficulty Strenuous Moderate [X] Easy Author Arkansas State Parks Staff Meg Matthews Date Published December 2016 March 2016 1.73-Carat Diamond Found at Crater of Diamonds State Park Dec 2016 ⁄ Meg Matthews Crater of Diamonds State Park is the only public diamond mine in the world. If a visitor finds a diamond its their's to keep. Recently, two guests who go to Crater of Diamonds on a regular basis found the third-largest diamond at the park in 2016. The diamond is a 1.73-carat white gemstone. The new owners of this diamond say they haven't yet decided what they will do with... Pinnacle Mountain State Park Rocks! Mar 2016 ⁄ Arkansas State Parks Staff Tucked away in central Arkansas, Pinnacle Mountain is one of the most accessible state parks for hiking, backpacking, climbing, camping, and biking.