I'll jump in to. I think this bead is also a fake, but made in China. A lot of beads of this type are currently being produced and artificially aged.
The colors are off, and the style is different from ancient beads. Only slightly, but still. The blue and yellow seem too bright. I agree that it is difficult to tell for sure from a picture. A lot of it comes down to having seen a lot of truly old ones, and having seen a lot of fakes. Visiting markets in China where lots of fake beads were being sold, has been a great education for me. However, sometimes, looking at so many fakes you can become too suspicious.......

Here are some images of beads from these markets that I think are similar. (though not exactly the same)