Blue john necklace two square drop silver punq0001997rthis enchanting necklace boasts two stunning faceted square pieces of rare blue john stone that has been sourced directly from treak cliff cavern in castleton the stones are placed within an exquisite sterling silver setting that hangs gracefully from the neckline from a delicate silver chainrall our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire where a team of skilled craftsmen turn th