An Edwardian Platinum, Black Opal and Diamond Brooch, in an intricate openwork design, containing one oval double cabochon cut black opal measuring approximately 17.86 x 14.40 x 5.82 mm, one old European cut diamond weighing approximately 0.40 carat and numerous old European, round single and rose cut diamonds weighing approximately 2.58 carats total. 9.50 dwts.