Where to Find Herkimer Diamonds in the United States
9 mapped herkimer diamonds spots across 2 U.S. states. Herkimer Diamonds is reported at multiple rockhounding spots across the United States. The map below shows where collectors most often find it on legal public ground.
Map showing where to find herkimer diamonds across the United States, with 9 mapped spots
Top states for herkimer diamonds
States ranked by number of herkimer diamonds spots in our database. States in bold link to a focused herkimer diamonds-in-state list.
Every herkimer diamonds spot we track
Sorted by state and county. Coordinates open in Google Maps.
| Spot | County | Minerals | Coordinates | Access |
|---|---|---|---|---|
| Crystal Grove Diamond MineCounty Highway 114 | Fulton County | 43.0503, -74.6362 | Paid / fee | |
| Ace of Diamonds & Herkimer Diamonds Mine | Herkimer County | 43.1315, -74.9741 | Public | |
| Ace of Diamonds MineNew York State Thruway | Herkimer County | 43.0110, -74.9720 | Paid / fee | |
| General Area (Herkimer County 1)State Highway 28 | Herkimer County | 43.1532, -74.9781 | Public | |
| General Area (Herkimer County 2)State Highway 29 | Herkimer County | 43.1377, -74.9484 | Public | |
| General Area (Herkimer County 3) | Herkimer County | 43.1112, -74.9947 | Public | |
| Diamond Acres MineStone Arabia Road | Montgomery County | 42.9621, -74.4752 | Paid / fee | |
| SprakersErie Canalway Trail | Montgomery County | 42.8942, -74.4838 | Public | |
| Morrison CoveSportsmens Access Road | Bedford County | 40.2437, -78.3852 | Public |
Herkimer Diamonds rockhounding FAQ
Where is the best place to find herkimer diamonds in the U.S.?+
New York, Pennsylvania have the highest concentrations of herkimer diamonds in this list. Each state's quality and access varies — open the linked state pages for a detailed view.
How many herkimer diamonds rockhounding spots does RockHoundR track?+
9 mapped spots across 2 states. The app keeps these on a map alongside your private finds.
Can I legally collect herkimer diamonds on public land?+
Casual hand collecting of common rocks and minerals like herkimer diamonds is allowed on most BLM and U.S. Forest Service land, with daily and annual limits set by the local field office. National parks, most state parks, and tribal land are off-limits. Always check with the managing agency before a trip.
How do I identify herkimer diamonds in the field?+
Field identification of herkimer diamonds comes down to color, hardness, fracture, and luster. The RockHoundR app links to geology details for each spot to help narrow down what you might be picking up.
Hunt herkimer diamonds on the map
Open RockHoundR to see these spots on a real map with public land overlays and trip-planning details.
