I was sure that I had seen something "very similar in shape" before. Not exact but close enough. They were making this style of women rings around 1912 and possibly earlier. Not that far off from the art deco period and possibly continuing into the 30's and 40's. I'm not positive about that, meaning I have no proof and would have to look through my stuff lol. They used precious gem stones rubies on the face as the center piece. So yours is possibly a very well done modification during the period? I just think it's premature to call these HJ rings without further study IMO.
