Sterling Silver Blue John Wide Oval Chunky Ring, R840. A classic, wide oval shaped sterling silver and Blue John ring. The hand polished oval Blue John gemstone sits proudly, making this ring a flattering shape for a multitude of fingers and a popular style choice. The gemstone has been sourced directly from Castleton, Derbyshire. Dimensions: 20mm x 13mm. All articles purchased from C W Sellors are lovingly and securely dispatched with our elegant jewellery packaging. Matching items also available within this collection.