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each layer of process shall be strictly controlled. it shall be made of titanium steel and the surface shall be vacuum plated to prevent fading gold and rose gold products are surface plating color, silver products are basically titanium steel primary color, permanent color preservation, diamond products are basically zircon, shiny color all the commodity styles are selected by the designer, with logo attached, which is beautiful and restores the original color, and is the first choice for matching.syi