Whitby Jet Necklace Marcasite and Silver. P2131. This stunning necklace boasts an unmissable cabochon diamond shaped piece of the finest Whitby Jet stone that has been sourced directly from the north east coast of Yorkshire. The stone is set within an enchanting sterling silver leaf and butterfly design that is embellished by exquisite marcasite stone, bringing a sophisticated sparkle to the piece. The pendant hangs gracefully from a delicate sterling silver chain complete with a classic bolt ring clasp for easy wear. 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 necklaces on our website. Sterling Silver and Whitby Jet.