Czech Fire Polished Beads. Color: Siam Ruby AB. 12mm Round. 10 Beads. In color Siam Ruby AB, AB or Aurora Borealis finish is a translucent rainbow finish applied to 50% of the beads' surface. In Czech Fire Polished beads, the shape called Round is actually more of an oval. Fire Polished beads are glass beads that are faceted by machine. T...