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Treasure Hunting For Herkimer Diamonds - By: David Cowley, 2008-07-03 Herkimer diamonds are double terminated quartz crystals that are found in Herkimer County, New York, hence the name. These crystals have usually have a shape that is very similar to diamonds with 18 facets and two terminators or points at the end. These beautiful gemstones were formed close to five hundred million years ago. COMMENTS Add a comment |