I have a question regarding the polishing of platinum. I will be purchasing a platinum mounting soon and was wondering if anyone knew how long it truly takes to polish platinum to get it to give it a good shine. I have gone to different stores asking if I buy a setting from them whether or not they would provide free polishing. My responses range from some stores saying no, because it takes nearly 3 hours to give it a good shine and remove the scratches to yes, since it only takes 1/2 an hour. is polishing the platinum something that I should expect the store to throw in? I know it all depends on how dull the metal is and how many scratches are in it and that platinum is much harder to polish than gold. Any help would be greatly appreciated even though I know this really isn't a diamond question.