Arkansas State Parks Trip Ideas Filter Park [X] Crater of Diamonds [X] Devil's Den Region Northwest Southwest Park Activity Diamond Digging Hiking Mountain Biking Watchable Wildlife Trail Type Mountain Biking Trail Difficulty Author Meg Matthews Mystina Swaim [X] Monika Rued Date Published November 2020 [X] September 2018 June 2017 [X] May 2017 [X] November 2016 [X] October 2016 Devil's Den State Park Visitor Gallery Sep 2018 ⁄ Monika Rued We love singing the praises of Devil's Den State Park but don't just take our word for it. Check out our visitor gallery and tag Devil's Den State Park or use #ARstateparks to share your pics and videos. Teen Finds 7.44-Carat Diamond at Arkansas’s Crater of Diamonds State Park May 2017 ⁄ Monika Rued An Arkansas teen found a 7.44-carat diamond at Crater of Diamond State Park after only searching for 30 minutes. It is the 7th-largest diamond found at the parks since 1972. Arkansas State Park IMBA World Summit Bookend Rides Nov 2016 ⁄ Monika Rued Arkansas State Parks has been involved in mountain biking since the 1980s and still have a variety of rides, competitions, trails and bike shops. Visitor Finds 2.03-Carat Diamond at Crater of Diamonds State Park Oct 2016 ⁄ Monika Rued It took less than an hour for a family to discover a 2.03-carat white diamond on the side of a plowed furrow at Arkansas’s Crater of Diamonds State Park.