Regency Vintage Black Amber Aurora Borealis Iridescent Butterfly Brooch

Regency Vintage Black Amber Aurora Borealis Iridescent Butterfly Brooch Stunning black butterfly with marquis amber, black and AB rhinestones. Black back Unknown metal. Vintage. Good condition. I questioned if the antenna were missing but alot of the brooches online did not have them, so maybe it's not flawed but maybe it is. It doesn't really look broken or anything. Measures about 2 inches by 1.5 inches.