Sterling Silver Blue John Whitby Jet Ornate Double Sided Oval Swivel Fob Necklace, P116_8. 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 Blue John and Whitby Jet. The stones are set in an ornate hinged sterling silver pendant, which moves with the wearer and features a unique 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.