Hello, I have received 3 different quotes of a platinum 6 prong tiffany setting from jewelers in my area (Jewelers Row in Philly). $500, 13-1400, and 1600. I am surprised at the range, especially the $500. It is from a place called Harzin Jewelers. It has great reviews on-line but isn't that cheap for platinum? I was wondering what your advice is and what you think I should be paying? I already have the diamond.