Sterling silver blue john round celtic stud earrings e149 these elegant round earrings feature hand carved blue john gemstones which have been sourced directly from the treak cliff cavern in castleton the highly polished blue john stones are framed by a celtic style cross hatching design of sterling silver with the earrings fixed with secure post and butterfly fittings for easy wear all our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire wh