Wow, beautiful looks to be old European cut diamond. Mine cut and European cut diamonds or gemstones had the culets(the tip off the bottom of the stone) cut out. She the perfect little circle in the dead center of the diamond?
Despite my love of all things vintage I've yet to see an episode of Mad Men.) But I HAVE seen some of the GORGEOUS outfits and who hasn't seen the stunningly curvy Christina Hendricks? Look at those beautiful clothes!