AWESOME NATURAL HERKIMER DIAMOND PENDANT. MOUNTED IN HEAVY SOLID .925 STERLING SILVER. COMPLIMENTED BY 2 BLACK ONYX ACCENT STONES. INCLUDES 20 " 2 mm. CHAIN. 73.5 CTTW OR 14.6 TOTAL GRAMS.These Highly Desired Gemstones Turn Heads. Herkimer Diamonds are Rare double terminated quartz crystals found only in a small are of Herkimer County, New York. This seems to be the Only Place that exact right conditions are to make these Beautiful Jewels. A double terminated crystal has points on both ends instead of just one end. These special crystals were first discovered in the early 1800's by settlers in New York and were named Herkimer diamonds due to their diamond-like shape. A typical Herkimer diamond has 18 facets: six upper, middle, and lower facets. They are also known for being Very Bright and Incredibly Clear