Thanks for the clarification.
Haven't had too many black, PVD watches, but I wanted to purchase a Luminox F-22 Raptor, and contacted the dealer about the finish. Luminox got back to me by email with a one word sentence. "At this time, none of our watches have DLC."
If that guy is right, it's a shame, because they have some awesome looking watches at a decent price point, and as you said, DLC is not that expensive a process. Maybe it would boost the pricing a bit too much for that genre?