Sterling silver blue john foxtail cushion stud earrings e1841 these statement earrings are part of our foxtail collection and they feature cushion shaped cabochons of rare blue john stone that have been sourced directly from treak cliff cavern in castleton the stones areplaced within simple sterling silver settings and surrounded by anintricately woven foxtail design the earrings are completed by a classic post and butterfly fastening for easy wear all our blue john jewellery is designed