Blue john 15 cushion foxtail silver necklace n972rthis elegant necklace is part of our foxtail range and boasts fifteen cushion cabochon pieces of rare blue john stone that has been sourced directly from treak cliff cavern in castleton the stones are set on a sterling silver foxtail chain that is fastened by a classic lobster clasp 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 th