This pin is from the Art Deco era, c1920s-30s. It has faceted blue crystal, and marcasite stones. They're all set in sterling silver. Marked with a tiny hallmark at the side. & Sterling on the reverse, This is quality brooch. The center stone is beautifully faceted to catch light, there is a scratch on the table of the stone & 1 missing marcasite as can be seen in the pictures. It is surrounded by marcasites set into a beautiful deco pattern. I was hunting for an important mark, like Fahrner, because it's made that well. All I can find is Germany & Sterling. It has been acid tested to be sterling silver. It's 2" x 3/4".