Herkimer diamonds are unique quartz crystals with which Melissa has designed a small limited edition group. From Herkimer, New York, these crystals resemble diamonds because of their double matrix formations (but are a lot cheaper!) Our prong set Herkimer diamond stud earrings will be that pair of earrings you can not stop wearing. This limited edition style is set in 14 karat gold. Due to the nature of these stones, the sizes may vary. Average stone size is 5 x 7mm.