9ct Yellow Gold Whitby Jet Domed Oval Signet Ring. R143. This stunning ring, part of our Heritage handmade jewellery collection, features a striking oval cabochon of Whitby Jet stone, sourced directly from the North East coast of Yorkshire. The stone is set within a highly polished domed 9ct Yellow Gold base and band. All our Whitby Jet jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen transform the natural Whitby Jet stone into these stunning pieces of jewellery. You can find other matching Whitby Jet jewellery online and in-store. Dimensions: Whitby Jet; 21mm x 9mm, Width of band; 3mm.