Twisting starburst purple aurora rhinestone pin

This is a stunning vintage pin. It is just costume jewelry but made heavy and well. It looks like a spinning starburst. (like fireworks!) The center cluster is made up of purple aurora rhinestones. The outer spinning points are embellished with smaller stones of the same color. Set in an antique silver toned setting, and measures about 2 1/2" across. No mark on the back that I could find. All stones intact and pin is in wonderful condition.