Where to Find Herkimer Diamond in New York

New York has 14 mapped collecting spots that report herkimer diamond, spread across 3 counties. The largest share sits in Herkimer County with 7 spots. 4 of the spots are on land mapped as publicly accessible, and 9 are fee-dig sites.

Standout herkimer diamond spots in New York

Hand-picked from the full list below, with the reason each one earns a trip.

Ace of Diamonds & Herkimer Diamond Mine
Herkimer County
The Ace of Diamonds and neighboring Herkimer Diamond Mine sit on the Cambrian Little Falls Dolostone, the type ground for the doubly-terminated clear quartz crystals known worldwide as Herkimer diamonds.
Sprakers
Montgomery County
The Sprakers roadcuts and quarry ground expose the same Little Falls Dolostone that hosts Herkimer diamonds, and the site is a long-known free alternative to the fee mines for finding doubly-terminated quartz.

Best counties for herkimer diamond in New York

Ranked by the number of mapped herkimer diamond spots. County links open the full rockhounding page for that county.

Every herkimer diamond spot we track in New York

Sorted by county. Coordinates open in Google Maps.

Spot	County	Minerals	Coordinates	Access
Crystal DazeState Highway 29	Fulton County	Herkimer Diamond	43.0715, -74.6912	Paid / fee
Crystal Grove Diamond MineCounty Highway 114	Fulton County	Herkimer Diamond	43.0503, -74.6362	Paid / fee
Ace of Diamonds & Herkimer Diamond Mine	Herkimer County	Herkimer Diamond	43.1315, -74.9741	Permission
Ace of Diamonds MineNew York State Thruway	Herkimer County	Herkimer Diamond	43.0110, -74.9720	Paid / fee
General Area (Herkimer County 1)State Highway 28	Herkimer County	Herkimer Diamond	43.1532, -74.9781	Public
General Area (Herkimer County 2)State Highway 29	Herkimer County	Herkimer Diamond	43.1377, -74.9484	Public
General Area (Herkimer County 3)	Herkimer County	Herkimer Diamond	43.1112, -74.9947	Public
Hidden Gem MineNorth Ann Street	Herkimer County	Herkimer Diamond	43.0434, -74.8596	Paid / fee
Russell Family MineLovers Leap Road	Herkimer County	Herkimer Diamond	43.0288, -74.8323	Paid / fee
Diamond Acres MineStone Arabia Road	Montgomery County	Herkimer Diamond Quartz	42.9621, -74.4752	Paid / fee
Herkimer Mountain Diamond MineOswegatchie Road	Montgomery County	Herkimer Diamond	42.9248, -74.4713	Paid / fee
Mohawk ValleyMohawk Valley Mineral Mining INC	Montgomery County	Herkimer Diamond	42.8811, -74.4670	Paid / fee
Soul Phamily FarmWest Main Street	Montgomery County	Herkimer Diamond	42.9988, -74.6790	Paid / fee
SprakersErie Canalway Trail	Montgomery County	Herkimer Diamond Quartz	42.8942, -74.4838	Public

Before you go

Read the herkimer diamond identification guide so you know what a keeper looks like in the field: Herkimer Diamond in the encyclopedia.

Herkimer Diamond in New York FAQ

Where can you find herkimer diamond in New York?+

The mapped spots concentrate in Herkimer County, Montgomery County, and Fulton County. Every spot on this page appears on the map above with coordinates and access notes.

How many herkimer diamond spots are mapped in New York?+

14 spots across 3 counties. The RockHoundR app keeps the same spots on an offline map with public land overlays, geology layers, and your saved finds.

Is it legal to collect herkimer diamond in New York?+

Hand collecting of common rocks and minerals in small amounts for personal use is generally allowed on BLM and U.S. Forest Service land, with limits set by the local field office. National parks, most state parks, and tribal land are closed to collecting. 4 of the 14 mapped spots here sit on land marked public, and 9 are fee-dig operations where you pay for access and keep what you find. Always confirm current rules with the managing agency before you dig.

More minerals to hunt in New York

Hunt herkimer diamond in New York with the map in your pocket

RockHoundR puts these spots on an offline map with BLM and Forest Service overlays, geology layers, and a log for your finds.