I'm in the jewelry business. Don't really care for diamonds at all, I prefer color. But the real point is that since the mid/late 80s this exact same argument comes up every year or two. Even using the same, outdated, no longer true "facts". And it's always in the guise of an enlightened rant.

I tend to think they are usually written by a guy who's girlfriend wants a diamond and he doesn't want to spend "all that money" on a rock.

Its "fashion" people. It is a "luxury" item. No one has to buy them. Besides, there are some great clear alternatives out there if someone is set on a "diamond". White sapphire, white topaz, moissanite, there are even some very nice CZs out there, but I'm sure those are way over priced as well.