Sterling Silver Whitby Jet Blue John Double Sided Oval Swivel Fob Necklace, P104_4. This classic fob swivel necklace is part of the C W Sellors Heritage handmade collection and features a double sided pendant set with oval cut locally sourced Whitby Jet and Blue John. The stones are set in a hinged sterling silver pendant, which moves with the wearer and features a unique wing design, hanging gracefully from an 18 inch sterling silver chain.  All our gemstone jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen transform the natural gemstones into these stunning pieces of jewellery. You can find other matching gemstone jewellery on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging.