This Limpet Shell Necklace is made from the molding and casting of a real found Key Hole Limpet 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 it then strung on a 16”,18”, or 20” sterling silver cable chain of your choice. The shell is offered in either small or large. The small shell is only 1" long and 1/4" wide including hook, the large size is about 1.25" long and 1/2" wide. This design is currently available in solid polished or oxidized sterling silver but other metals and finishes 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 all sizes and finishes, but you can place an order for an item that is 'out of stock' by requesting a customization, please allow 1 week to complete.