Vintage Large Rhinestone Aurora Borealis Domed Circular Art Deco Brooch Pin

This is a large vintage circular brooch with concentric circles of small round aurora borealis rhinestones. The pieces domes out toward the middle. It is unsigned, but it is very similar in style to vintage Weiss brooches. It is possible that it is an unsigned piece, but I can't say for sure. The back is a silver tone pot metal that has been painted with a blue coating. Much of the coating has been worn away with age. The style of metal backing makes me believe that this may be from the 30s or 40s. It is a beautiful piece. No missing rhinestones. It sparkles gorgeously in the light. Roll back clasp in the back. Approximately 2.5" in diameter.