Sterling Silver 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 Sterling Silver 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 and other Whitby Jet rings online and in-store. Dimensions: Whitby Jet; 21mm x 9mm, Width of band; 3mm.