A collection of rare ammonite stone cufflinks. No two pieces are the same; each stone is hand cut & is fitted individually to its case. This gives each pair their own charm & rarity. Ammonite is an extinct group of marine invertebrate & the stone has been pyritized- which means it has been crystallised. The ammonite originates from the Michailov area, Ryazan region in Russia & is from the Upper Callovian (Middle Jurassic period from 176-161 million years ago). The back of the case has been skilfully cut out to reveal the true beauty of the stone to its fullest. Rhodium plated sterling silver.