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 0.30ct 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 clasp for easy wear. All our Blue John jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen turn the raw Blue John stone into these stunning pieces of jewellery. You can find other matching Blue John jewellery and other Blue John necklaces on our website. 18ct White Gold, Blue john and 0.30ct Diamonds.