18ct White Gold Whitby Jet Blue John Double Sided Oval Fob Necklace, P100. This classic double sided fob necklace is part of our Heritage handmade jewellery collection and features an oval locally sourced Whitby Jet gemstone on one side and an oval Derbyshire Blue John gemstone on the other. The stones are framed within a heavy highly polished 18ct White Gold setting with a large ornate bail. This item is complete with an 18 inch White Gold chain.  All our Whitby Jet jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen transform the natural Whitby Jet stone into these stunning pieces of jewellery. You can find other matching Whitby Jet jewellery and other Whitby Jet necklaces on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging. Dimensions 47mm x 23mm, Whitby Jet and Blue John stones; 25mm x 20mm.