Large Metallic Sphere/Ball: Likely a polished, smooth gold-plated or gold-tone bead/charm.

Smaller Opalescent Bead: Typically a Freshwater Pearl, a Moonstone, or an Opal (or imitation opal/mother-of-pearl) bead or pendant.

MaterialGold Plated or 18k Gold Vermeil (a thick layer of gold on sterling silver) over Sterling Silver or Stainless Steel.

Tarnish-Resistant, Waterproof (or water/sweat resistant), and Hypoallergenic.