It's normal - they'll all go through different subtle color differences, sometimes brought on by hormones. I know exactly what you're describing, as I have a girl that has an olive tint to her so that she looks green as well. It really is cool to see and almost impossible to capture in pictures.
I also have a mojave male that is glowing like a gravid female right now that makes him look like a hypo mojave. And yes, I know he's a male, because he's sired clutches for me! LOL
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