Sterling silver whitby jet marcasite curved oblong necklace p1318 this classic pendant features a large cabochon of whitby jet surrounded by an ornate sterling silver frame decorated with marcasite the necklace offers a very bold look with added sparkle hanging gracefully from an 18 inch sterling silver chain 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 int