Colourful Victorian 15 Carat Gold and Natural Opal Brooch. A late Victorian period brooch. Solid 15 carat yellow gold example. Set with a single, oval shaped, natural opal. Working pin and hinge. SIZE ; 40mm long, 6mm x 12mm opal approx. HALLMARKS ; none, tests as 15ct. As we keep stock off site please allow one or two days to answer any questions or queries you may have. Please note all rings come with a free jewellery box, though this might not be the one in any photographs shown. Various extra enlarge photographs and good detailed descriptions from an experienced antique, modern and jewellery dealer. Auctiva offers Free Image Hosting and Editing. Auctiva gets you noticed! Track Page Views With.