Blue john necklace oblong 9ct yellow gold p1160rthis simple and stylish necklace boasts an unmissable cabochon rectangular 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 mesmerising 9ct yellow gold setting that hangs gracefully from a delicate yellow gold chain completed by a classic lobster clasp for easy wearrall our blue john jewellery is designed and crafted within our very own workshops in ashbou