Vintage Signed Large Purple Rhinestone Crystal Brooch Pin

This a truly stunning pin. Elegant, and in like new condition. The cone-shaped crystal rhinestones are all present and in excellent condition. The pin measures about 3.5 inches at the longest point, and is signed. Unfortunately, I don't recognize the designer mark, but I'm doing more research. In the meantime, I took as clear of a pic as I could in case you can figure out! This would make an excellent gift, so I'm including a gift pouch.