A word or two about layering: The layering of noble metals over less expensive materials has been around for a long time. Obviously the goal is to give the consumer the look of precious metal at a fraction of the price. Here again, quality versus price should speak volumes. The marketplace will give you examples of gold over base metals, gold over silver, gold (or platinum) over steel, and so on. Of course the more you are willing to spend, the more you should expect in return. Layered noble metals are measured in millimeters, or mils. The more mils (layers) involved, the greater the cost and, in theory, the better the quality and durability. It is prudent to keep in mind that all layering can wear off and that layering can also vary dramatically in color, but not just in the difference between yellow, rose, or white gold. The accuracy of reproducing the look of solid gold will also vary, so judge accordingly. The most common thickness of layers is one to three mils, over base metal usually or sometimes steel, and aimed at a low-price-point customer. I wouldn't count on this production lasting very long, and of course the price should reflect that. In the five- to ten-mils layer ranges, you are getting into better quality production. This layering will most likely be over 316L steel and should be designed for increased wearability. You will likely find this degree of layering in watches ranging from the low hundreds to several thousand dollars, depending on the brand. In less common instances you will find unusually heavy layering, as much as 20 mils. This is exceptional work and, in my experience, is found only on higher-end, hand-finished watches. Layered products are not good candidates for custom engraving, as doing so will likely expose the underlying material.