I need advice. We have looked at a very nice Harry winston HW setting. It is a .51 for around 5,700 $ . Would this be a good buy considering it is a resale? or would we be better off without a branded stone? I really like the setting, size and brand are not that important to me. Also how would it be to resize up 1 or 2 sizes? Thank you for your help, I am very clueless with all this.