Ancient Phum Dzi Longevity Bead & Coral

This is a Ancient Phum Dzi beads with Tibetan Coral.
The Phum Dzi Beads mean "Longevity" .(Somebody says Bon-Dzi-Beads)
It came in Bon Religion Era. look like a "Indian Etched Agate Beads" but made step , kind of stone and Era are different.（Thanks SoldOut）