This is done using the russian spiral technique. It is a very easy procedure and works up quickly too. It can be done with different sizes of seed beads. You can use 11/0 seed beads with 8/0 or 6/0 or 10/0 seed beads with 6/0 seed beads or even 6mm crystal rondelle bead. I have used 11/0 with 8/0 seed beads for this particular necklace.