Silver Whitby Jet Marcasite Cushion Ring. R745. This simple and stylish ring boasts a stunning square shaped cabochon of the finest Whitby Jet that has been sourced directly from the north east coast of Yorkshire. The stone is framed by glittering Marcasite stones and surrounded by an exquisite sterling silver setting that sits on a classic silver band. All our Whitby Jet jewellery is designed and crafted within our very own workshops in Derbyshire where a team of skilled craftsmen turn the raw Jet into these stunning pieces of jewellery. You can find other matching Whitby Jet jewellery and other Whitby Jet rings on our website. Silver Whitby Jet Marcasite Cushion Ring