Sterling Silver Whitby Jet Round Celtic Knot Necklace. P3133. This unique necklace features a hand carved triangular shaped cabochon of Whitby Jet that has been sourced directly from the North East Coast of Yorkshire. The highly polished gemstone is framed by a sterling silver celtic knot and open circle design. Sold complete with an 18 inch sterling silver chain 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 on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging. Dimensions: 25mm x 18mm including bail, Whitby Jet; 6mm x 6mm.