Czech Fire Polished Beads. Color: Two Tone Opaque Amethyst/Crystal. 4mm Round. 50 Beads. In color Two Tone Opaque Amethyst/Crystal, a combination of Opaque Amethyst purple and clear Crystal. 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. Th...