You'd have to have two fabrics sewn together and that would be too much bulk for a roller shade. A Roman would be a better choice, but I think you'd have to go custom. I'm not aware of a dual fabric shade in a readymade.

Why not get a bottom up shade that covers the bottom of the window and leaves the upper part uncovered until you want it covered?

https://www.blinds-2go.co.uk/roller-blinds/30138/choices-horizon-stone.html

I found these!!! However the vendor is in the UK, and they do not make this one in a 94" width :( The search continues.

Thanks for the Roman and top-down suggestions- not exactly what I'm looking for but I appreciate the feedback!

That's just the fabric design. The top won't be more transparent than the bottom. Anyone that makes custom shades and sells fabric, can probably find a similar fabric.

Hey There: These blinds do not exist. The reason is that each fabric would need to be made to exactly the length of the roller shade...that's a pretty pricey endeavor.

But how about these ones: Colors are fading from the bottom to the top.

You can also go with bottom up top down pleated shades or honeycomb shades - they have a different look but they do the trick of privacy and natural light at the same time:

www.PleatedBlindsStore.com