I received a pair of diamond studs as a hand me down. They are very beautiful. These are the stats: G, H color...4.28 carat tw...one appraisal (for ins. purpose) says I2, but every jeweler I have brought them to, including the jewelery co. that did the appraisal says they are definitely not I2...they all say I1 or VS2..mostly I1...they have great color, and give off a beautiful flash in the right lights when clean.....heres my question: I called the jeweler where they were purchased and asked them if I could trade up...mostly in terms of a better clarity. She told me to bring them in and we can see....So, if I did trade up, I don't want to spend over 10-15k more. .... What can I expect to pay for a trade up of the same size with better stats......OR, should I just keep them, be happy and maybe get some jackets.....thx for any advice....