18ct yellow gold whitby jet diamond medium cross heart charm g774 this romantic charm features a stunning heart shaped cabochon of the finest whitby jet stone sourced directly from the north east coast of yorkshire the beautiful 18ct yellow gold frame is embellished by a dazzling brilliant cut diamond attach the charm using the lobster clasp fastening at c w sellors we have an expert team of gemstone and diamond specialists who handpick and grade each jewel to meet our high standards and