It doesn't seem that anyone really understood what the original poster was asking. If I understood correctly, she was asking if her boyfriend had a ring fetish, and if anyone had ever heard of such a thing. If this was her question, I can definitely tell her that the answer is yes. I know this because I am a guy that has a serious jewelry fetish, and there are many of us out there. I get extremely turned on when I see women wear rings and bracelets (the more the better).
My wife is not much of a jewelry girl, so I kept this a secret for the first 4 years of our marriage. Finally, I broke down and told her about it. She still doesn't wear much jewelry on a day to day basis, but now she will wear things for me when we are home alone once in awhile (not nearly often enough in my opinion..lol).
I would suggest that the original poster ask her boyfriend about this. He will probably be embarrassed at first, but will eventually open up. I will say that I am very jealous that he has a woman that wears so many rings all the time (although I love my wife to death as she is).