Opal engagement rings

So, I've been going a little engagement ring crazy, and I know that I really want a opal in my engagement ring and not a diamond for a lot of reasons.

Does anybody know of anywhere that sells lines of actual engagement rings that have opals? I have looked a little at jewelry stores and a lot of their opal rings are fashion jewelry and kind of big. I have small, skinny fingers so I want something a little simpler. Anyone know where to look?