Yellow gold is a rather hard material to mimic, and rose gold is harder still—perhaps the closest metal that can mimic the look of oxidized gold is copper, and even that will still pose a discernible difference for those in the know. When it comes to white gold, certain grades of silver can be mistaken for metal, as can platinum and stainless steel in terms of color. However, it must be noted that stainless steel has a different shine to it than gold, which may be a clear giveaway if you’re looking to use it as a dupe for white gold.