Crystal Grove Diamond Mine | Dig for Herkimer Diamonds in Upstate NY

Crystal Grove Diamond Mine & Campground offers one of New York’s most unique and exciting rockhounding experiences. Located along Timmerman Creek, this site is famous for Herkimer Diamonds — sparkling, double-terminated quartz crystals found only in this region of New York. Visitors of all ages can rent tools and buckets to dig, break rock, and hunt for these natural treasures, often finding beautiful specimens on matrix or druzy clusters. Beyond mining, the property features peaceful camping (tent, RV, and primitive sites), showers, a store, and relaxing creekside spots perfect for families, groups, and nature lovers. Open seasonally from spring through fall, it’s a memorable hands-on adventure that combines geology, outdoor fun, and the thrill of discovery in the scenic transition zone between the Mohawk Valley and Adirondacks.