Blue john mosaic silver stud earrings e807rthese unmissable stud earrings boast small mosaic style pieces of rare blue john stone that has been sourced directly from treak cliff cavern in castleton the stone is placed within a sterling silver tear drop setting that is completed by post and butterfly fastenings for easy wearrall our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire where a team of skilled craftsmen turn the raw blue john stone