I can’t say for sure, but I don’t think I would mind if my chosson didn’t buy me a diamond ring. I think it might actually bother me if he did, because I’d be terrified of losing it. Also, I don’t like rings – I don’t even wear watches, because it bothers me to have things on me.
I would want my chosson to give me some kind of jewelry though, but it doesn’t have to be terribly expensive.