Blue john 3 stone oval foxtail silver necklace n971rthis exquisite necklace is part of our foxtail range and boasts three stunning cabochon pieces of rare blue john stone that has been directly sourced from treak cliff cavern in castleton the three stones are set along the centre of the unmissable sterling silver foxtail chain that is completed by a classic lobster clasp for easy wearrall our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire w