No you can't, not without an intense light source and through a macro setting in my camsera. I haven't tried my 60x loupe yet, but are going through my new photos on my pc after I gave it another clean to see what is, and post better phots soon!
Hmmm, I'd probably describe it as a rutile inclusion or an inclusion of another mineral rather than a band... I think rutile is kind of cool. I know my MIL is always on about heated and treated Amethyst so I guess it could have been something that was heated but it looks more like a band of rutile or something in your photos, and I think it is unlikely to be treated if it is that old. You can see from these crystals in the link below how you can get colour zoning and bands of other things inside Amethyst...
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