A little-known & not often used piece in the Queen's collection, it uses a stone that she doesn't often choose: opals, black opals with gold specifically, in the design of a spray of flowering gum. Opals generate an array of colours. The brooch comes from Australia. It was a wedding gift in 1947 from the Returned Sailors', Soldiers' and Airmen's Imperial League of Australia. The official wedding gift list notes that the brooch's casket bears the badge of the league in gold.