Hi dude,
I agree with you there on prism ruby.
The only pair of Oakley's I have are the matte black Holbrook, so I've never seen Oakley's prism ruby lenses "in the flesh" so to speak.
Most of the product pics I've seen of prism ruby seem to have a bit of orange in there too, but then why would they call it "ruby"?
I've found a "fire red" non-genuine Oakley replacement lens, but it's probably just prizm ruby and legally they aren't allowed to call it that.
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Anyway, I'm not seeing any blue on the arm in the RDJ pic, so I don't think it's this version...
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So best guess based on the RDJ pic, is that it's this matte black model with prism ruby...
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I've found 2 pics of an "actual pair" of the above model for sale, which I suppose is a fairer representation and shows the lenses a bit more red.
Interestingly, the lenses look even more red when there's something behind them, despite them being mirrored.
Notably it's the folded arms, which look red, as seen through the lens. This would point towards the Prism Ruby taking on a much more red appearance overall, when actually worn...
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Hope this helps dude!!