Sterling Silver Blue John Marquise Stone Adjustable Bracelet, B1129. Contemporary and stylish, this bracelet features a marquise shaped cabochon of the finest Derbyshire Blue John gemstone, from Castleton, Derbyshire. The Blue John gemstone is framed elegantly in a sterling silver setting and the bracelet is completed by a sterling silver, adjustable chain. All articles purchased from C W Sellors are securely dispatched with our elegant, personalised jewellery packaging. Matching items available within this collection. Dimensions: 15mm x 8mm.