Dainty Paperclip and Herkimer Diamond Quartz Necklace. Three Genuine Herkimer Diamonds on an 18” Argentium Silver Paperclip Chain. Argentium is a superior, anti- tarnish silver. Herkimer “Diamonds” all have 8 sides as it is a naturally grown quartz, but each one is slightly different. They are found in Herkimer, New York. They make a nice April birthstone substitute for traditional diamonds.