Although in theory you could scratch anodized aluminum, the anodized layer is both harder and more abrasion resistant than the underlying raw aluminum. If you'r

Although in theory you could scratch anodized aluminum, the anodized layer is both harder and more abrasion resistant than the underlying raw aluminum. If you're thinking about scratching chrome-plated steel, let me ephasize that it is much harder to scratch a hard-anodized finish. The only anodized-aluminum object I have ever known to get scratched is the older iPhones (5?). That's probably a combination of people physically dropping them from heights and Apple's choice of a thin, relatively soft anodization process. A clear anodization finish leads to "bright aluminum" - the natural shine is absolutely preserved. Natural oxidization on the other hand does dull the metal. Yes, all forms of aluminum look different than steel. Gold and platinum do have the advantage of being homogenously non-oxidizing. But I think anodized aluminum is a great alternative with many advantageous properties for jewelry (low cost, wide variety of beautiful colors, high strength/weight ratio, low density, non-allergenic). I'm not sure why it's used so infrequently - perhaps because of the connection with aluminum cans and thus the image of "cheap"/"disposable"?