Silver Whitby Jet Marquise Flame Necklace. P2594. This delicate pendant has been created using the finest quality, hand carved Whitby Jet. This marquise shaped Whitby Jet gemstone is surrounded by a flame-shaped design of solid Sterling Silver. The pendant is sold complete with an 18 inch silver chain. 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 necklaces online and instore. Silver Whitby Jet Marquise Flame Necklace. Pendant 15x10mm, Whitby Jet 7x4mm.