The Clam Shell Necklace is made from the molding and casting of a real found Venus Clam shell in recycled silver. I collected the original empty mollusk shell on a beach in Delray, Florida and then sent it to a local, family owned casting company to be cast in multiples of solid metal. Once the casting is returned, I solder on jump rings and the piece is cleaned up and hand polished with care to be strung on a 16”, 18” or 20” sterling silver cable chain of your choice. The shell charm is only 1" long including bail and 1/2" wide. This design is currently available in solid Oxidized or Polished sterling silver but other metals are always available, message me for custom options and a quote. All HKM Jewelry pieces are properly hallmarked for metal type and stamped for authenticity. This item is usually always available in either finish, but you can place an order for an item that is 'out of stock' by requesting a customization, please allow 1 week to complete.