Sterling Silver Whitby Jet Large Oval Signet Ring. R190. This classic signet style ring boasts a hand carved Whitby Jet stone, sourced directly from the North East coast of Yorkshire. The stone is inlaid within a thick band of solid sterling silver. The finished piece is smooth and sleek, and showcases the highly polished stone to great effect. All our Whitby Jet jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen turn the raw Whitby Jet stone into these stunning pieces of jewellery. You can find other matching Whitby Jet jewellery and other Whitby Jet rings on our website. Dimensions: Whitby Jet stone 12x14mm.