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Ace of Diamonds & Herkimer Diamond Mine — Rockhounding in Herkimer County, New York

Updated July 2026

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. It is the single most famous rockhounding destination in New York, with productive vug-lined dolostone that reliably yields loose, water-clear crystals. Reported finds include herkimer diamond. Below: coordinates, access notes, nearby spots, and trip-planning links.

Ace of Diamonds & Herkimer Diamond Mine photos

Public image records connected to this spot or its reported material.

1 photo

Map showing Ace of Diamonds & Herkimer Diamond Mine in Herkimer County, New York

Quick details

Access
Public area
Postcode
13406

Land & collecting status

Generally open to casual rockhounding

Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.

Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.

Sources & verification

Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Found at Ace of Diamonds & Herkimer Diamond Mine

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Nearby rockhounding spots

Other rockhounding spots within driving distance of Ace of Diamonds & Herkimer Diamond Mine.

Ace of Diamonds & Herkimer Diamond Mine FAQ

Why is Ace of Diamonds & Herkimer Diamond Mine one of the best rockhounding spots in New York?+
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. It is the single most famous rockhounding destination in New York, with productive vug-lined dolostone that reliably yields loose, water-clear crystals.
Where is Ace of Diamonds & Herkimer Diamond Mine?+
Ace of Diamonds & Herkimer Diamond Mine is in Herkimer County, New York, at 43.13146, -74.97414.
What rocks and minerals can you find at Ace of Diamonds & Herkimer Diamond Mine?+
Ace of Diamonds & Herkimer Diamond Mine is reported to produce Herkimer Diamond.
Is collecting allowed at Ace of Diamonds & Herkimer Diamond Mine?+
Generally open to casual rockhounding. Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig. Always confirm current rules with the managing agency before a trip.
How do I get to Ace of Diamonds & Herkimer Diamond Mine?+
Open the directions link to navigate to 43.13146, -74.97414 in Google Maps. Some spots are remote — check road conditions before driving out.

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