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Herkimer diamonds are not actually diamonds, but are double-terminated quartz crystals discovered within exposed outcrops of dolostone in and around Herkimer County, New York and the Mohawk River Valley.The "diamond" in their name is due to both their clarity and natural faceting. They are valuable as compared to crystals that are found at other sites and are smoky. Herkimer diamonds are powerful quartz crystal and they have therapeutic effect on the body and mind. ... Like any other diamonds, the Herkimer diamond value is determined by its color, clarity, cut, and carat weight.