Vintage Coro Silvertone Aurora Borealis Enameled Leaf Flower Brooch

Vintage crescent shaped Coro brooch in a silvertone setting.  A row of leaves along edge with open work tiny flowers.  Leaves and flowers are painted with ivory colored enamel.  Sparkling AB stone flower centers.  Back is marked Coro, but it is hard to make out.  Approximately 2" X 1-1/2".
Very nice vintage condition.  Slight wear to enamel can be seen with magnifier.  Back may have been touched up with silver paint in a couple areas, see photos.