Does anyone know what the profit margins are for diamond vendors? The reason I''m asking is I''ve been doing some comparative shopping both online and in stores, with online prices being noticeably cheaper. The store vendors and even an appraisor I talked to on the phone have a heavy bias against online diamonds, claiming they are lower quality cuts which is why they are sold online (which I don''t buy into it because the online vendors seem much more willing to give info that quantifies the cut quality.) I have a solid candidate from a store, but in negotiating price the salesman hasn''t come down much, claiming he''s already offering the best price he can give me when in actuality he doesn''t even know what HE paid for the diamond because he got it as a part of a larger pool of diamonds (which makes some sense, but he ought to have some idea of the average cost of each stone I''d think.) He calcs the price based on a spreadsheet that looks a lot like the Rapaport price list. Am I getting a good deal, or is this guy just stubborn?