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So, what's the difference between DLC and PVD? When looking at black-coated watches, these are usually the two finishes discussed. Often, you'll hear that DLC is "better." Technically, these aren't apples-to-apples terms. DLC is a coating material, link but it can also use physical link vapor deposition as its link application process. It stands for "diamond-like carbon," and that means that the coating compound in question is primarily composed of carbon atoms.