Silver blue john marcasite butterfly necklace n992 this stunning butterfly necklaceis handmade in sterling silver andfeatures four beautifully hand carved blue john gemstones sourced directly fromtreak cliff cavern in castleton which are surrounded in a silver frameaccentedwith sparkling marcasite gemstones the necklace is completed with 45cm long sterling silver chain it is an exquisite and detailed piece which would make a beautiful gift all our blue john jewellery is designed an