Double Strand Pearl & Chain Necklace In Gold PlateHandmade and ethically sourced form Bali. Material: Size: One Size Plated jewellery, as the name suggests, has a thin layer of precious metal over a base metal (ie zinc alloy, brass, stainless steel). The layer of precious metal is usually between 0. 175 to 0. 5 microns (in comparison, a dollar bill is 200 microns). Since the precious metal layer is very thin, friction between your skin and the plated jewellery can slowly rub off the plating. Also,