These Herkimer Minis have a remarkable clarity and beauty. Not as formal as a cut diamond they have a similar eye catching brilliance. They are small enough to wear every day. We have three grades available and also double headed AA Herkimers. Please see options below. Each stone measures just under 1cm and is presented on a 50cm Italian sterling silver fine curb chain. Herkimer Diamonds are double terminated quartz that are only found in upstate New York. They are called "diamonds" because they are unusually hard and clear (about as hard as an emerald). Herkimer Diamonds are uncut stones; they come out of the ground with natural faceting. Each one, regardless of size, has 18 facets.