As to authenticity, all our watches and jewelry are 100% authentic. We do not buy or sell fake jewelry or watches. Some custom or aftermarket accessories such as certain diamond dials, diamond bezels, and bands can be either; 1) aftermarket/custom, or 2) factory original. Even all our aftermarket/custom accessories are still 100% authentic pure solid precious metals and 100% real diamonds as advertised, they just weren't made by the factory of that brand. We do not sell any low-quality custom/aftermarket pieces, all our accessories are of the highest quality workmanship with perfectly calibrated diamonds just as you would see on a factory original. PLEASE read the entire description to be sure you know if you are buying a factory original, or aftermarket/custom authentic. If you are not sure what you are buying, please contact us for clarity.