I have a brooch that I don't recognize the markings on. I believe its silver although on the front it looks like gold in places. It has blue and white enamel and has oxidized to a black color.
http://www.flickr.com/photos/veycourtco ... 663981816/
http://www.flickr.com/photos/veycourtco ... 663360941/
http://www.flickr.com/photos/veycourtco ... 663982482/