I´ve just gotten the "Rolex GMT-Master II" in FG and green dial. Even though I have several fake watches I also have the genuine Rolex GMT-Master II in steel.
The "gold" model looks 100% like the genuine one, when it is on your arm, nobody will notice the difference -amazing!
However, when it comes off, the watch is much lighter than the genuine GMT, I guess the genuine 18 crt. gold model is even heavier than the all 904L steel version?
But all in all an amazing watch!