Silver blue john marcasite marquise beaded edge ring r749 this stunning ring is part of our marcasitehandmade jewellery collection and boasts a strikingmarquiseshaped cabochon of the finest blue john which has been sourced directly from the treak cliff cavern castleton in derbyshire framed by glittering marcasite stones the stone is placed within an exquisite sterling silver beaded detailsetting and is completed with a classic sterling silver band all our blue john jewellery is desig