Blue john heart diamond 18ct white gold necklace p1547c this unmissable necklace boasts a stunning cabochon heart shaped piece of rare blue john stone that has been sourced directly from treak cliff cavern in castleton the stone is set within an exquisite 18ct white gold two layered heart design that has been embellished by dazzling 030ct diamonds giving the piece a sparkly and elegant finish the pendant hangs gracefully from a matching white gold chain completed with a classic bolt ring c