I think it's virtually impossible to be certain if a Jatim is genuine from a photograph nowadays. The fakes, at their best, have gotten so good, with acid treatment and other artificial aging processes. As Hendrik said in the previous thread, the genuine ones do often seem to feel different, but other than provenance, the only real way to be sure is through a scientific analysis of the glass - but that is dificult to arrange, complicated to carry out, and prohibitively expensive!

Having said that, I don't see any reason to doubt your assumption that this bead is authentic. I'd love to see a close-up of the cylinder-shaped bead in your earlier picture. It's a rare one.

I haven't taken any more pictures of the fifty or so beads that I acquired recently in Indonesia and elsewhere, but for the moment I'll attach a grouping of beads I've shown here once before. I'm as sure as I can be that they're all genuinely ancient. The large central pelangi is one of the best I've ever seen, but it has, like a lot of the beads that came out of Indonesia in the late 80s and the 90s, been polished to restore its surface.

Cheers,

Will