Black Gold plated Brushed Link Chain sold by the foot measures 28x23mm Oval & 20mm Round. The Black Gold Ruthenium plated chain has been hammered then brush finished for added brilliance. The metal chain is an approximate 2mm metal width and 1mm thickness soldered to ensure a perfect link. Ruthenium, otherwise known as Black Gold, originates from the Platinum Metal and has been eCoated to seal the metal from environmental changes.