Getting certificate after the purchase

I have been lucky enough to get the proper diamond education before I purchased my fiancees engagement ring. I got a VVS2, I in color, emerald cut 62 point loose stone. I gave in the color characteristic to get the superior clarity expecially needed for an emerald cut. I in color is still near colorless. Who can really see the difference unless its sitting next to a D, E, or F? It also came with a GIA cert.

Here’s my question. My friend was not so lucky. He bought a ring at a large national chain jeweler. He saw my ring with the cert and a separate appraisal document. Now he wants a cert and appraisal document for his ring. The problem is it did not come with either. I would not think that the appraisal from this type of jeweler is worth anything because all they will do is give you a form letter with their usually over priced marked up high retail as an indicator of the value. Also, I believe that only loose stones are evaluated for purposes of creating a cert.

Question: Is there some evaluation service he could pay for to have a cert created for his ring after the fact so to speak? He really wants one for insurance purposes. Somehow I doubt it. If this is a possibility can you tell me who I should direct him to have this done.

Thanks in advance.