Gold-plated case is plated with a layer of gold or gold alloy in the upper half of the shell, gold-plated layer is usually between 2-20μm. Gold-plated shell color beautiful, mostly golden yellow, but this case is not wear and tear, a long time some of the gold-plated layer will gradually wear out, revealing the bottom shell color, affecting the appearance.
According to the use of view: gold-plated layer 2μm, after six months will gradually pan-color. Gold-plated layer 3-5μm, gold-plated layer can maintain 1-2 years. Gold-plated layer 5-7μm, gold-plated layer can be maintained for 2-3 years. Gold-plated layer 8-10μm, gold-plated layer can be maintained for 3-5 years. Gold-plated layer above 10μm, gold-plated layer can be maintained for more than 5 years. Gold plating layer in 20μm or more than 20μm, gold-plated layer can be maintained for 10 years. This is the duration of normal maintenance, but in the event of acid, alkali, salt or corrosive gases, the retention period of the gold plating layer will be significantly reduced. The appearance of angular friction is also easier to fade. General imported gold-plated layer 5μm above is not marked. Gold-plated layer 10μm or more, and some manufacturers in the case of the table ear notes. The back cover of gold-plated case is mostly made of stainless steel.