I have recently purchased my engagement ring and have a GIA certificate and would like to know whether it's wise to have it appraised and recertified. The cost of the ring was high and the cost of the additional appraisal and recertification is about 200$. Now the thought of having it recertified seems silly, for if a place appraises it and says it matches the GIA certificate than I don't see the need for the recertification.

I think the idea is to have it matched to the original cert and then appraised for a value for insurance purposes. Spending another 200 for an engagement dinner might be a better deal? The reason for the high cost is due to the 2.34 CTs total weight.

Truth be told I don't see the ROI on the redo of the cert.

You are right. There is no need to get another grading report once the diamond already has one from GIA. Moreover, GIA has a tracking system that allow them not to issue different gradings for the same stone.