18ct Yellow Gold Whitby Jet Blue John Double Sided Celtic Edge Pear Cut Fob Necklace, P410. This classic double sided fob necklace is part of our Heritage handmade jewellery collection and features a pear cut locally sourced Whitby Jet gemstone on one side and a pear cut Derbyshire Blue John gemstone on the other, for the choice of two elegant looks. The stones are framed within a heavy highly polished 18ct yellow gold setting with a Celtic edge and a simple gold bail. This item is supplied complete with an 18 inch yellow gold chain.  All our British gemstone jewellery is designed and crafted within our very own workshops in Ashbourne, Derbyshire where a team of skilled craftsmen transform the natural British gemstones into these stunning pieces of jewellery. You can find other matching British gemstone jewellery and other British gemstone necklaces on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging. Dimensions: 28mm x 20mm, Whitby Jet Blue John stones; 16mm x 16mm.