Sterling silver blue john oval rope twist ring r011 this elegantring is part of our heritage handmade jewellery collection and featuresa strikingoval shaped cabochon of the finest blue johnstone that has been sourced locally from the treak cliff cavern in castleton the stone is placed within an exquisite sterling silver twisted rope setting and is completed with a split shoulder sterling silver band all our blue john jewellery is designed and crafted within our very own workshops in ashb