A certificate is diamond's "fingerprint".
A diamond grading report is a detailed explanation of a diamond's characteristics such as its cut, weight and dimensions. Many diamonds are certified by an independent laboratory so that purchasers can feel confident that their diamond is indeed of the quality the seller represents. A certified diamond's quality is guaranteed, and is therefore more valuable than an uncertified stone. A certificate verifies a diamonds identity and value and is recognized by all gemologists.
Diamonds are certified by independent grading entities whose expert gemologists evaluate each diamond's particular characteristics and attributes, such as clarity, cut, color, carat weight, fluorescence and other characteristics. Loose diamonds from Diamond.com are graded by either the GIA (Gemological Institute of America), AGSL (American Gemological Society Laboratories), or IGI (International Gemological Institute), the world's most respected grading entities. All of these institutes including the GIA, IGI and the AGSL are known for their consistency, stringency and impartiality when grading diamonds.
Below is a sample diamond grading report from the Gemological Institute of America, the foremost authority on diamond grading. The majority of diamonds you'll find at Diamond.com come with a GIA report
A diamond grading report from an independent laboratory is not an appraisal, which estimates the monetary value of a particular stone. It is an unbiased, informed opinion made by an experienced gemologist. You will receive the original certificate or report with your diamond order.
Purchasing loose diamonds accompanied by certificates allows one to comparison shop and know exactly what they are getting. The slightest change in a diamond's grading can significantly alter its value
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