Sterling Silver Whitby Jet Curved Triangle Necklace. P320. This contemporary necklace is part of our Heritage handmade jewellery collection and features a striking Whitby Jet cabochon. The gemstone is set within a polished sterling silver curved triangle design. Sold complete with an 18 inch sterling silver chain which fastens with a classic bolt ring style clasp. All our Whitby Jet jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen transform natural pieces of Whitby Jet into these stunning pieces of jewellery. You can find other matching Whitby Jet jewellery on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging. Dimensions: Pendant: 20mm x 13mm including bail, Whitby Jet: 10mm x 10mm x 10mm.