The centerpiece of this necklace is a Dong Son bronze ear ring to which a gold band and loop to hang it with has been applied.
The majority of the blue glass beads are from Mali.There are two small gold plated silver beads from Timor. Towards the end are two Dong Son bronze tubes and finishing with Indo-Pacific beads. The tie bead is a hexagonal bi-cone from Java, at least 1000 years old.
Read about Dong Son in Musings https://baliqueartsofindonesia.com/blogs/blog/dong-son-in-indonesia