Sterling silver whitby jet marcasite heart locket necklace p2151 this vintage style locket features a highly polished cabochon of genuine whitby jet stoneatthe centre of a patterned sterling silver open framework accented with sparkling marcasite gemstones perfect for keeping someone close to your heart made with sterling silver and includes an 18 inch silver chain all our whitby jet jewellery is designed and crafted within our very own workshops in ashbourne derbyshire where a team of