This is truly an impressive bead!  It will be the envy of all!
Cord on bust is for display only.
Approximately: 25mm diameter and 148mm hole to hole
Material: unknown metal content. The Tibetan jeweler calls the main material blue copal.

Beautiful and unique handmade Tibetan jewelry made in Nepal and Tibet by Tibetan refugees.
Repoussé refer to a metalworking technique in which a malleable metal is shaped by hammering from the reverse side to create a design in low relief.