Ghau

Image source from nepal crafts blog -  link here.

A Gau (also spelled Ghau or Gao) is a Tibetan Buddhist amulet container or prayer box, usually made of metal and worn as jewelry. As a small container used to hold and carry powerful amuletic objects, the Gau is culturally equivalent to Latin American package amulets, African-Americanconjure bags or mojo hands, South American charm vials, and American wish boxes.  Source link here.