18" Bead Tube Chain Necklace 18k Yellow GoldThis 18 karat yellow gold chain necklace measures 18 inches in length and 2. 75 mm in width, featuring a bead tube chain style. The bead tube construction creates a cylindrical chain made up of small hollow segments that catch and reflect light along their rounded surfaces, producing more dimension than a flat chain. At 2. 75 mm wide, this chain has noticeable presence on the neck without being overly bold or heavy, making it practical for daily wear.