Art Deco Dress Clip with Rhinestones

I wish I had the rest that belonged to this dress clip! I believe this is one of a pair of dress clips (part of a duet). There must have been a frame to fasten both pieces too. The patent (1852188)on the back goes back to 1932. When assembled, the two dress clips must have been quite impressive - the one I have is just a bit shy of 3 inches.

Thanks for looking:)