9ct Yellow Gold Blue John Love Letters Initial Z Necklace, P3473. From the new \'Love Letters\' collection designed and handcrafted by C W Sellors, this 9ct yellow gold necklace features an initial \'Z\' with a circular Blue John stone, sourced directly from Castleton, Derbyshire. The pendant and stone hang elegantly from a 18 inch 9ct yellow gold chain. All our Blue John jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen transform natural pieces of Blue John into these stunning pieces of jewellery. You can find other matching Blue John jewellery on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging.