Vintage Silver and Rhinestone Butterfly Brooch

This is a lovely vintage rhinestone butterfly brooch, made of silver-tone metal and clear rhinestones. This brooch belonged to a family member and has been stored in a jewelry box in a smoke-free home. Nothing on the brooch says who designed it, and I'm not sure of its age. I do know it's been in a jewelry box for at least 20 years. Please view photos for a better description.