Blue john pendant swirl design with diamonds 18ct white gold p2663 this enchanting necklace boasts an unmissable round piece of rare blue john stone that has been directly sourced from treak cliff cavern in castleton the stone has been placed within an exquisite 18ct white gold setting and surrounded by 040ct brilliant cut diamonds in an overlapping swirl design creating a breathtaking sparkle the pendant hangs gracefully from a delicate 18ct white gold chain completed by a classic bolt ri