Yea, I know a lot of the "fancy" ones, especially, have been made in the last few years -- and some of them are pretty good. The color and surface of the green one you picture isn't anything like the green ones I have or have seen . . . and I have no clue about the red. I'd WANT to believe it was old, but I'm not sure the chances are very good that it is. It's the kind of super-rare color that might make it worth it to someone to fake, and, as Galen said, there's been a lot of that going around. The brown & blue ones are too common to be worth faking.
Long way of saying "Gee, I don't know!"