Vintage Heavy Natural Stone Ring

This awesome heavy ring has a huge faceted stone. The metal of the ring is very solid and not at all pliable. It was likely gold plated at one time. Prior to polishing it, I would've guess it was copper, but after a polish it has come up as a rose goldtone.... so am unsure of the metal. I believe its a size 7 but I'll get an accurate read on it soon andvl update the listing