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A grading report is a "blueprint" of a diamond. It tells you the diamond's exact measurements and weight, as well as the details of its cut and quality. The report will precisely point out all the individual characteristics of the stone. Grading reports also serve as proof of the diamond's identity and value. A certificate is not the same thing as an appraisal. A grading report describes the quality of a diamond; an appraisal places a monetary value on your diamond.
There are many diamond labs that issue grading reports, but the Gemological Institute of America (GIA) and the American Gem Society Lab (AGSL) are the two most widely regarded and recognized diamond grading labs in the world.
Shopping for diamonds that have grading reports will allow you to make an informed choice about your selections and to comparison shop. You can compare one diamond with a particular weight and quality to other diamonds of similar weight and quality to determine which value is better.
If a jewelry store offers to sell you a loose diamond without a grading report, keep in mind that it means you’re buying the diamond based only on the salesperson's claim about its quality. A trained gemologist may disagree with the salesperson's assessment.
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