Blue john necklace rose 9ct yellow gold p1945rthis simple and stylish necklace boasts an unmissable cabochon round piece of rare blue john stone that has been sourced directly from treak cliff cavern in castleton the stone is placed within an exquisite 9ct yellow gold setting which hangs gracefully from a matching yellow gold chain complete with a classic bolt ring clasprall our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbyshire where a team of