You’ll need the following supplies to get started:
Your choice of cabochon (stone, glass, or porcelain)
Your choice of seed beads
Matching thread (Nymo or Silamide)
Beading needle (Size 10 or 12 is a good choice.)
Interfacing (used in sewing) or *Lacy's Stiff Stuff
* Lacey's Stiff Stuff is a product that is basically very heavy interfacing and is available at most places that sell seed beads. I've used it before and highly recommend it. However, if you can't find it, regular interfacing (which is available in a variety of thicknesses) is also fine to use.
Once you learn this technique, you can finish the back a number of different ways depending on what you are making. Here are a few jewelry projects that show different finishing methods: Beaded Cab Necklace and Beaded Cab Barrette.