18ct white gold whitby jet 175ct diamond shoulder marquise ring 312 1779 05 0 this elegant 18ct white gold ring featuresa marquise shapedhand carved whitby jet stone that has been sourced directly from the north east coast of yorkshirethis ring boasts a total of 175 carats of princess cut diamonds that are set into the shoulders giving a truly dazzling display of light and colour all our whitby jet jewellery is designed and crafted within our very own workshops in derbyshire where a team