Sterling Silver Whitby Jet Marcasite Double Swallow Necklace, N1049. This elegant necklace features two beautifully hand carved Whitby Jet gemstones sourced directly from the North East coast of Yorkshire, which is set bellow the symmetrical double swallow design. The birds are embellished with stunning sparkling Marcasite gemstones and hangs beautifully from an 18 inch sterling silver chain. All our Whitby Jet jewellery is designed and crafted within our very own workshops where a team of skilled craftsmen transform natural pieces of Whitby Jet into these stylish pieces of jewellery. You can find other matching Jet jewellery to complement this necklace online and in stores. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging.