Blue john earrings oblong studs 9ct yellow gold e819 these simple and stylish earrings boast two cabochon rectangular pieces of rare blue john stone that has been sourced directly from treak cliff cavern in castleton the stone is placed within exquisite 9ct yellow gold settings that delicately curve around the lobe the studs are completed by classic post and butterfly fastenings for easy wear all our blue john jewellery is designed and crafted within our very own workshops in ashbourne der