Mystic Seven Herkimer Diamond necklaceMystic Seven Herkimer Diamond necklace with seven perfectt, sparkling Herkimer Diamond Quartz. Sterling beads nestled between Mystic Seven Herkimer Diamond necklace 16 Sterling silver chain. Herkimer Diamonds, a form of quartz crystal, are named after the location they were first discovered in Herkimer County, New York, USA. Herkimer Diamonds can be clear or included. Inclusions are often black carbon deposits. Herkimer Diamonds differ from most