9ct yellow gold whitby jet wide marquise celtic necklace p1393 this elegant necklace features hand carved whitby jet that has been sourced directly from the north east coast of yorkshire the highly polished whitby jet marquise gemstone is framed within a unique sterling silver celtic design with the pendant being presented on a 18 9ct yellow gold chain all our whitby jet jewellery is designed and crafted within our very own workshops in ashbourne derbyshire where a team of skilled craftsme