The basic patent invention is the idea that the pure gold could be mixed with a ceramic such as a Boron Carbide powder and then compressing that very finely ground mixture into a mould under high pressure and then applying heat below the melting temperature of gold to sinter mixture in the mould, solidifying it to form the watch casing.
However, the other claim is that the gold could be also mixed with fine DIAMOND POWDER then sintering that powder mix into the casing mould. Think how hard that watch casing would be. . . and perhaps it would have a very nice glint to the surface. I wonder what black diamond powder would do to the mix?