Club 49
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Gem and mineral site

Crystal Grove Diamond Mine, St. Johnsville

Herkimer “diamond”

A PUBLIC Herkimer-diamond dig and campground on Lassellsville Road, quieter than the Route 28 mines: crack the dolostone or work the creek and the loose rock for clear crystals, and camp on site to dig the whole weekend. Family-friendly and cheap.

Where it is

Herkimer “diamond”
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The source

https://en.wikipedia.org/wiki/Herkimer_diamond

Nearby

Other places on the map within a couple of hours.