C W Sellors 18ct White Gold Blue John Faceted Oval Shape Necklace. PUNQ0000209 Hand cut, set, and polished in our own workshops, this unique Blue John oval shaped 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.