I would take the Webb attribution with a pinch of salt. In the US (no offence meant), if they can't ID it, it's Bristol glass (whatever that is!), Webb or Stevens and Williams. Likely that's Harrach too.
I think your coralene is heat fixed, as it's all there. I think what they do is use a sticky enamel (i.e., glass powder in a suitable liquid) to paint on the design, sprinkle with the glass beads and then heat it just enough to fix it. After all, raised enamel stays raised after heat fixing.
Glue is the cheap option, paint, sprinkle, dry and done. Oops, the glue degraded and it fell off!
Those pictures are much better than the previous ones. Comparable to the Goldberg items.
Goldberg was a decorator that used blanks from Harrach, among other companies. The company did subcontract work (so possibly this pot is Goldberg for Harrach), but sold most of its output under its own name.