Sterling Silver Whitby Jet Marquise Overlap Necklace. P3136. This contemporary necklace features a hand carved marquise shaped Whitby Jet gemstone expertly set in a sterling silver curved drop. 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 stylish pieces of jewellery. You can find other matching Whitby Jet jewellery along with matching Whitby Jet pendants on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging. Matching items are available within this collection. Dimensions: 30mm x 8mm, Whitby Jet; 14mm x 5mm.