Found a suitable two-tiered lampshade for my big black globe lamp, with a good enough Buy It Now price. but just to make sure, I emailed the seller.
I wanted to be sure it was fiberglass and not paper. I made the mistake of buying a Eames vintage paper lampshade. Not a single bit of light shines through the shade, which defeats the purpose of having a lamp at all, unless you don't mind light only shining from the top and bottom.
They wrote back saying it was paper, but I wrote back a second time, because it looks like parchment/fiberglass, and. . . They didn't bother to reply a second time.
I was all ready to send that payment to them had it been real fiberglass/parchment, but I guess they didn't need the money that bad.