Yeah she is a girl, she deffinately has an ovipositor, although you can't tell from the pics, I checked as soon as I got her. But she is a lot bigger than my other bettas.
It's hard to tell from the two pics you posted, but in the pic with the flash Saturn's colouring looked to me rather like a green lace. Whatever he is, though, he's beautiful- they both are!
Maybe I forgot to mention, but Saturn is impossible to photograph! Like completely impossible, I can photograph every other fish I have but he just always moves or is always doing something to screw the picture up.