Clear rhinestone dimensional round brooch

Silver tone, 1 3/4" round, bezel set clear rhinestone brooch. Almost like a flying saucer 🛸 the outer edge has 2 levels, then another 2 levels surrounding the center rhinestone. Open back, foiled stones. There is something on foil of one stone as shown. I am not going to try to remove it. Unsigned, but this is a quality piece. Heavy for it's size and sparkle from the stones is amazing! 50/60s space race period, in my opinion.