Blue john necklace curved oblong 9ct yellow gold p785rthis mesmerising necklace boasts a wave of cabochon rare blue john stone that has been sourced directly from treak cliff cavern in castleton the stone is placed an exquisite 9ct yellow gold oblong setting that hangs gracefully off a delicate yellow gold chain complete with 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 skill