My boyfriend and I are starting the process of looking to purchase a ring. I was under the impression that if I went to Tiffany''s I should be fine. I knew that they would be a bit more than other retailers becasue of the name but I was fine with that. I know about the 4 C''s but after reading some of the posts there are things I never knew to look for such as angles, percentages, etc.) My question is what can I expect to find for app. 10k? I live in the Northern Virginia area. I am more interersted in the quality of the stone vs the size. Please give me whatever advice or info that you will find useful in my search. Thanks a bunch!