Silver core

This is the process of placing silver cores throught the hole in a bead. This can be done in a variety of ways:

Gluing silver rivets into the bead

Using a bead press and silver tube

Using dapping punches and silver tube

This is a useful link to see how silver cores can be placed into glass beads http://www.dawnandevan.com/silver_core.htm

There are several different bracelet systems available which people collect silver cored beads on.