Silver Whitby Jet Marquise Offset Bangle. B981. This sleek and contemporary hinged bangle features a long marquise shaped Whitby Jet stone, sourced directly from the North East coast of Yorkshire. The stone is offset in a marquise shaped frame of Sterling Silver and the bangle is completed with a solid 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 bangles on our website. Silver Whitby Jet Marquise Offset Bangle. Whitby Jet stone 30x9mm.