Is a diamond grading report still valid after a diamond is recut and set into jewelry?

A simple setting of a diamond into jewelry shouldn't change the stone's attributes, but if it is polished in order to make it adjustable to a certain jewelry product than obviously it must be re-examined. Once a diamond is polished it cut attributes need to be observed, since it had been modified to some extent. Color and clarity grades are likely to be the same as before (since color and clarity don't depend on a diamond's cut), but cut description (not the diamond's general shape but rather its symmetry and proportions) and carat weight are inevitably different compared to the diamond's initial state.

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Your jeweler is right. The diamond grading report is a record of all of the diamond's physical characteristics which influence its value. Some of the diamond parameters documented in the diamond certificate include the diamond's carat weight, its cut, color and clarity, polish, fluorescence, as well as its symmetry and the proportions of its culet, girdle, table and depth. Although some of these factors stay basically the same even if your diamond has been recut (probably color and fluorescence), the vast majority of them change once the diamond is recut. For example, cut and carat weight will significantly change: the diamond will now have a different weight and size if its had some of its girth shaved off of it, and the quality of its cut may have changed too - it may have even improved! In any case, the information on the diamond certificate no longer pertains to the actual diamond that you own, so if you want an accurate diamond certificate, you need to get a new one. However, your jeweler should have mentioned that to you earlier, because you can only get a loose diamond evaluated at a diamond grading laboratory such as the GIA (Gemological Institute of America), and if you just had your diamond reset, you probably don't want to go around popping it out of its setting again and shipping it off to be graded. However, you can probably live without a diamond grading report in this case, unless at some point you want to sell your diamond and your buyer demands one.

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