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A bead is a small, decorative object that is pierced for threading or stringing. As an alternative to piercing, plastic beads may be Moulded Onto a Thread during manufacturing; these MOT beads are often used for the throw necklaces worn at Mardi Gras.

Beads range in size from under a millimeter to over a centimeter in diameter. Glass, plastic, and stone are probably the most common materials, but beads are also made from bone, horn, ivory, metal, shell, pearl, coral, gemstones, polymer clay, resin, synthetic minerals, wood, clay, fiber, paper, and the seeds of the Bead tree.

Beadwork is the craft of making things with beads. Beads can be woven together with specialized thread, or adhered to a surface (e.g. fabric, clay).

Types of decorative beads include:

Chevron beads
Fire-polished beads
Faux natural beads
Lampwork beads
Millefiori beads
Pressed glass beads
Seed beads
Trade beads or Slave beads