This is a rare & unusual stone cufflink. Each stone is a genuine fossilized item, ensuring that each cufflink is unique & has its own individual charm & rarity. The trilobites are a well-known fossil group of extinct marine arthropods that form the trilobite class. The trilobites became extinct at the end of the Permian period, about 515 million years ago. Each trilobite stone is unique, varying in size & form, & accordingly each cufflink pair has been hand selected to find the best match for the stone. The silver case is moulded around each individual stone creating a tailored case for it, the rim has twisted cable around the edge. Matching shirt stud set is available. Rhodium plated sterling silver.