Hi all - I emailed Stan Ng at Apple to ask about both the coating on the gold SS and space black SS watches as I have ordered both and am trying to decide which to keep. His response is below. Now that I know the gold SS also has a protective coating, I have no idea which one I'll keep. Anyone know the difference between DLC and PVD coatings? "The Space Black Series 4 is DLC coated and the Gold Series 4 is PVD coated. Both provide a layer of scratch resistance. Hope that helps! Thanks."