Blue john necklace organic shaped silver p1843rthis exquisite necklace boasts a stunning organic shaped piece of rare blue john stone that has been sourced directly from treak cliff cavern in castleton the stone has been placed within a simple sterling silver setting and hangs gracefully from a delicate silver chain completed by a classic bolt ring clasp for easy wearrall our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire where a team of sk