18ct White Gold Whitby Jet Blue John Small Double Sided Oval Fob Necklace, P219. This beautiful double sided fob style necklace features the finest Whitby Jet and Blue John. The hand carved gemstones are flush set into the organic, contemporary oval shape giving a smooth and highly polished finish. Sold complete with an 18 inch 18ct white gold chain which fastens with a classic bolt ring style clasp. Dimensions: 18mm x 15mm. All our Whitby Jet and Blue John jewellery is designed and crafted within our very own workshop where a team of skilled craftsmen transform natural gemstones into these stylish pieces of jewellery. You can find other matching Whitby Jet and Blue John jewellery on our website. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging.