The second bird posted is a female and the bird Mike posted is a male...the colors look corect on both with about normal saturation. The bird in flight has no upper color on its chest is why I said it may be a mutation. There is a white chested and it is a mutation that can be normal in a wild bird. The chest on the flight bird appears to have some color in it but it is hard to tell if it is a juvi or not. Wiki has some pretty good general info on them.
http://en.wikipedia.org/wiki/Gouldian_Finch
We used to raise these back in the late 80's to mid 90's.
Bill