1930's cheapest Geometric Art Deco Silver and Glass Brooch

cheapest A beautiful Art Deco brooch. Three interlocking glass circles. The largest forrest green and the smallest black circle are opaque, the white one is sheer so you can see the green one underneath. I'm not sure if the silver outlive is actually silver but it did shine up when I used silver polish on it. I estimate that it's from the 1930's. It's simple, elegant and striking. In pristine condition.