18ct White Gold Whitby Jet Blue John Bell Diamond Swivel Fob Necklace, P113_10. This stunning pendant features Whitby Jet and Blue John gemstones set in an eye catching 18ct white gold design. Hand carved to a bell diamond shape, the clean cut edges and mirror like shine make this pendant contemporary and unique. Presented on an 18 inch 18ct white gold chain through a fixed bail at the top.  All our gemstone jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen transform the natural gemstones into these stunning pieces of jewellery. You can find other matching gemstone jewellery and other gemstone necklaces on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging.