Sterling silver blue john owls face necklace n945 set within the eyes of this quirky owls face pendant are two striking and hand carved round cabochon pieces of blue john that has been sourced directly from the derbyshire blue john cavern in castletonthe sterling silver owl hangs gracefully off a delicate sterling silver chain completed by a classic bolt ring clasp for easy wear all our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire where