I puchased the black Riva 510 in Feb 2012. I noticed recently that the finish gets scratched easily. I do live in Florida and I wear my pv on a lanyard under my blouse while at work. Unless I have atomic sweat (which wouldn't surprise me) I would think the finish would last longer. No worries, I scraped the rest of it off and now have stainless ones instead. Just wanted to give you a heads up just in case.