Ultra Hard coatings

What is the best wear resistant hard coating available??

depends on your application

be specific

It is materials (can be metals or organic compounds) that mixed with fine diamond powder. So, it can be in the forms of bulk, film, or coatings. One of the applications is the diamond dies used in drawing process of metal wire in wire and cable industry.

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Titanium Nitride is about 85 on the Rockwell C hardness scale. It is a pretty gold color too.

When you are selecting a hard surface coating, you should take the substrate into consideration. Also think about what sort of environment the coating will be exposed to.

This is a pretty lame question. It is analagous to asking Motortrend which is the best motor vehicle on the road without specifying you want a truck, car, SUV or the like.

As pointed out by Aaron, TiN is used quite extensively in the manufacture of drill bits, however, zirconium nitride (ZrN) is starting to see more use in this area with slightly better hardness and lubricity. Of course if money/cost is not an issue CVD diamond is quite impressive and there are myriad of other more exotic surface coatings.

If you want a better answer, you need to specify the substrate and application.