C W Sellors 18ct White Gold Blue John Faceted Large Oval Necklace PUNQ0000232.  Hand cut, set, and polished in our own workshops, this unique Blue John large oval necklace is set in 18ct white gold. The Blue John gemstone is sourced directly from Castleton, Derbyshire.  This item also comes complete with an 18 inch 18ct white gold chain.  All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging. Matching items are available within this collection.