Blue john necklace pearl nunq0000545 this stunning and sophisticated necklace boasts several round cabochon pieces of rare blue john stone that has been directly sourced from treak cliff cavern in castleton the stones have been paired with pink peach and white pearls which accentuate the vivid colours of the blue john the necklace is completed by a classic round t bar clasp for easy wear all our blue john jewellery is designed and crafted within our very own workshops in ashbourne derbysh