The core of this dichroic focal bead is made with lavender glass coated with the pattern, corkscrew. It's been encased with grey transparent glass. It's a lovely focal bead that measures 1 1\/8" x 1\/2" and has a hole that's 3\/16" wide. The glass used is Bullseye and the bead has been properly annealed for both strength and your enjoyment. Thanks for looking!!