Use these 8mm cat's eye round beads in dark grey to accent other bright colors for a bold contrast in a jewelry design or with dark earth tones. The 8mm size is perfect necklaces, so use these beads as eye-catching focal points! These cat's eye beads, or fiber optic beads, feature a bright band of light that shines across the center, resembling a cat's eye. Try mixing these beads with textured agate gemstones finished with silver components. These beads are sold on 16-inch strands.