Herkimer Diamond. Chain. Lobster Clasp. Length: 17 inches (43.1 cm). Width of Gemstone: approx .5 inches (1.27 cm). Your jewelry will come in a jewelry box, tied with a ribbon. A great everyday necklace. The Herkimer Diamond necklace is a raw crystal piece that ranges from clear to threads of grey & black in it. The different strands are what makes these gemstone inherently beautiful.