Silver Whitby Jet Marcasite Square Ring. R751. This stunning ring boasts a delicate square shaped cabochon of Whitby Jet stone that has been sourced directly from Whitby on the north east coast of Yorkshire. The stone is placed within an exquisite sterling silver setting embellished by dazzling marcasite stones, bringing a sophisticated sparkle to the piece. The ring is completed by a classic sterling silver band. 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. Sterling Silver and Whitby Jet.