Despite their diamond misnomer, Herkimers are are actually six-sided, double-terminated quartz crystals and are relatively valueless. Nevertheless, unscrupulous jewelers during the Civil War often tried to pass off these stones as the more precious variety. We love the visual joke created when these severely flawed (yet impressively sized) stones masquerade as diamonds in our version of the classic "solitaire" engagement-ring setting. A handhewn sterling silver raised bezel grips the Herkimer with four square prongs. Every unique stone is set by hand; expect yours to have irregularities like cracks, dark spots, and milky-colored mineral impurities. Small stones measure about 3/8" at their widest point, and the large stones measure about 5/8" wide.