So, enlightened1, what do these have to do with the Apple Watch and its legitimate 18k gold alloys? Not a damned thing. 18K gold can be alloyed with sliver, copper, beryllium, tungsten, iron, anything, depending on what your purpose is for the finished properties you want. Karat is based purely on what the percentage of Gold to other alloying materials making up the final product, nothing else.
I am trying to figure out what your point is.