I know people are going to think this is crazy, but how about not buying a diamond engagement ring. I don't think I need to explain why, and believe me I'm not judging, I have one or two diamond myself. But I saw this Kalevala ring and thought it would make a stunning engagement ring only to find out it was a Cubic Zirconia stone. With the way it's set, I doubt anyone would ever know, and you could wear it guilt free. Just an idea. Available at Finnish Gifts.