An appraisal generally entails a dollar value. It can be perfomed on a set or unset stone. However, for accuracy, an unset situation is preferable...
Grading an already set diamond is educated guesswork at best. Those with little experience in grading mounted diamonds are very likely to have problems.
If your diamond has certificate from a recognized laboratory like GIA or AGS you should supply the certificate with the ring. It’s not easy to accurately grade color when the ring is set, color is graded from the pavilion side. Its also common practice to place a prong over an inclusion if it’s on the edge.
As Dave was saying an appraisal is primarily to determine a monetary value not to verify the accuracy of the certification.
If your reason for sending a diamond to an appraiser is for an opinion on cut quality and visual performance then its better unset, still not much point in not including the certificate
Wayne
Melbourne Diamond Exchange Ltd (Australia)
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