18ct Yellow Gold Whitby Jet 0.37ct Diamond Large Cross Heart Necklace. P1906. This elegant necklace is part of our Cross Heart collection. It features a large hand carved heart shaped Whitby Jet stone that has been sourced directly from the North East Coast of Yorkshire. The individual highly polished Whitby Jet has been framed within a 18ct yellow gold 0.37ct 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 Whitby Jet jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen transform the natural Jet into these stylish pieces of jewellery. You can find other matching Whitby Jet jewellery and other Whitby Jet earrings on our website. Dimensions: Approximately 25 x 26mm.