If that was the only point of distinction, I'd be right there with you. But the fact that natural diamonds are quite likely to have been mined using what amount

If that was the only point of distinction, I'd be right there with you. But the fact that natural diamonds are quite likely to have been mined using what amounts to brutal slave labor (even the ones that are "certified ethical," because these people have no qualms about subverting the certification process) is a pretty big issue for me.