Sterling silver beads. Measuring 18" in length a with a 2" extension. Approximately 80 silver beads are used in making this necklace. The beads measure between 3mm & 6mm. This is a light weight necklace that is easy to wear either along or with a pendant. 18" Sterling silver beaded necklace Sterling silver : Is and alloy of silver containing 92.5% by weight of silver and 7.5% by weight of other metals, usually copper. The sterling silver standard has a minimum purity of 925. Oxidized silver (black coloring in the silver) is a process that many jewelers use to give sterling silver a black patina. It gives the jewelry an antique or tarnished look. The process consists of taking clean