There’s an old joke that says men should never buy clothes for their wives or girlfriends because they will never buy the right thing. If that’s true for clothing, then I think it’s probably ten times as true when it comes to diamond engagement rings. Not only because most men don’t know the size of the ring they should be buying, but because they don’t really know the first thing about diamond rings at all, or diamonds in general. I know I sure didn’t.