Herkimer Diamond Ring - adjustable / xs B -$55 CAD Size adjustable band for size between 2. 5~ 4 North American ring size Approx. ring face 10mm x 8mm Bench crafted slightly textured sterling silver ring with Herkimer Diamond *Herkimer Diamonds are double terminated quartz crystal. They are known as one of the most powerful of all quartz crystals and often used in meditations. They act as powerful amplifiers when you are using them with other gemstones.