Diamond cut is a type of polishing, it uses a lathe to polish the face by cutting out the metal it has a different look from hand polished, you can see the tram lines.
You would have to remove the lacquer, the water inside would of removed the shine, so either get them diamond cut again, then relacquered, or just remove lacquer and hand polish them...but you cannot lacquer these, so pain in the ass, have to have a good sealant on then to stop them oxidising again.
will 14`s fit on an 8v?