The Emerson coatings are Black T which is the black blades. I have a 7A spearpoint in this coating. It shows wear and has scratches from use but never saw a spec of rust anywhere on the blade, the coating is really good, no flake, and it does wear very well, just shows marks.
Next I have a CQC7B WAVE Tanto tip with the Silver coating. This knife also is very rust resistant but I do see specs from time to time especially around salt water but not as bad as other knives I have used in this manner. The silver coating also shows very little wear much less than the black T coating.
I also like the Silver coated Emersons for defense the knife just looks bigger and is more visiable to a Bad Guy. In my eyes that is a plus. Thats why I carry a Silver Commander
These are the two factory coatings that EKI offers and IMO they are REALLY great.