18ct Yellow Gold Blue John Diamond Medium Cross Heart Necklace. P2653. This elegant necklace is part of our Cross Heart collection. It features a medium sized hand carved heart shaped Blue John stone that has been sourced directly from Castleton, Derbyshire. The individual highly polished Blue John has been framed within a 18ct yellow gold 0.03ct diamond mount that embraces the gemstone in a cross design. It sits gracefully on a 18\" 18ct yellow gold chain completed by 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 transform the natural Blue John into these stylish pieces of jewellery. You can find other matching Blue John jewellery and other Blue John earrings on our website. Dimensions:  Approximately 21 x 22mm.