In fact I believe these beads are simple folded beads. (It is a Middle Eastern and not a Chinese approach to glass beadmaking. However, some Ban Chiang beads from Thailand also seem to be simple folded beads--or what I prefer to call "rolled-pad" beads. I am not necessarily saying there is any connection. More that this is something that fledgling glass industries did in ancient times, before conventional wound and drawn beads were devised or incorporated.)

There is no tangible way to date these beads, since they have not (to my knowledge) been recovered archaeologically from a well-dated site. However, in terms of the look of these beads, they have much in common with faceted crystal beads that are most likely Sassanian.

By the 6th or 7th centuries, typical multicolored jatim were being made in Indonesia. (This is why they are no longer identified as being "Majapahit" beads. Once it was realized that jatim were earlier, they provisionally became "srivajaya beads." Now it appears that even this may not be early enough.)

So, I would be inclined to make a comparison between Sassanian faceted rock crystal beads as the prototypes of faceted glass beads from Indonesia. The Sassanian beads are found in the Middle East AND in Java/Indonesia. It's hard to know for how long they might have been manufactured. Recent copies of these bead, made from recycled glass, and made via lapidary techniques can be mistaken for the old beads. Another thing to be aware of.

Jamey