FYI, some watch brands such as Rolex & certain vintage Omega's (not sure about the new ones), they do not employ gold plating. Instead, they use gold rolling, where a layer of stainless steel is sandwiched between two pieces of gold and compressed under high pressure rollers to create a cold weld.
Hence, the layer of gold is very much thicker and more durable. I have seen these type of formings on dual tone bracelets for rolex and omega.