There's bias even in that wording though. They're not "artificial" diamonds. They're real diamonds, grown in a lab instead of in the ground. Agreed with your

There's bias even in that wording though. They're not "artificial" diamonds. They're real diamonds, grown in a lab instead of in the ground. Agreed with your broader point though. IIRC there's an economics term for this—goods that don't follow the standard supply/demand price curve, but where increasing price actually increases demand over some range. Ah, "Veblen" goods, apparently.