Blue john oval frill silver stud earrings e009rthese simple and elegant stud earrings boast two stunning oval cabochon pieces of rare blue john stone that has been sourced directly from treak cliff cavern in castleton the stone is set within an exquisite sterling silver base with an intricately crafted ribbon detailing around the edge creating a beautiful vintage finish the earrings are completed by classic post and butterfly fastenings for easy wearrall our blue john jewellery is designed