A bead is a small, decorative object that's pierced for threading or stringing. Beads range in size from under a millimeter to over a centimeter in diameter. Glass, plastic, and stone are the most common materials, but beads are also made from bone, horn, ivory, metal, shell, pearl, coral, gemstones, polymer clay, metal clay, resin, synthetic minerals, wood, ceramic, fiber, paper, and seeds. A pair of beads made from Nassarius sea snail shells, approximately 100,000 years old, are thought to b… (More on Bead)