Arkansas State Parks Trip Ideas Filter Park Crater of Diamonds Pinnacle Mountain Region Central Southwest Park Activity Hiking [X] Climbing [X] Diamond Digging [X] Watchable Wildlife Trail Type Day Hikes Trail Difficulty Moderate Strenuous [X] Easy Author Monika Rued [X] Arkansas State Parks Staff [X] Meg Matthews Date Published November 2019 May 2018 [X] December 2016 [X] 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.