Beautiful Art Nouveau Platinum 18k Gold 25 Diamonds 19 Sapphires 1 Pearl Brooch. The brooch weighs 4 grams. It measures 34mm wide and 15-1/2 mm high. This is a lovely Art Nouveau brooch in excellent condition offered at a great price and guaranteed to please the new owner. We test every item marked or not and this tests for platinum and 18k solid gold.