18ct White Gold Whitby Jet 0.89ct Diamond Marquise Ring. R1017. This exquisite ring features a stunning marquise shaped cabochon of the finest Whitby Jet stone, sourced directly from the north east coast of Yorkshire. The beautiful 18ct white gold frame is embellished by dazzling 0.89 carats of brilliant cut diamonds.  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 a team of talented in house designers who combine their talents to bring you our exclusive Precious Gemstone collection. You can find other Jet pieces online and in store to compliment this ring. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging. Matching items are available within this collection. Dimensions: Whitby Jet: 11x5mm.