A certificate is a "blueprint" of a diamond jewellery. Also called the diamond grading report or diamond dossier. It tells you about the diamond jewellery's exact grading, weight, as well as the details of its cut and quality. It precisely points out all the individual characteristics of the stone. Certificates also serve as proof of the diamond's identity and value.

A certificate is not the same thing as an appraisal. A certificate describes the quality of a diamond, but it does not place a monetary value on the gem.

Shopping for certified diamond jewellery allows you to make an informed choice about your selections, and to comparison shop. You can compare one diamond jewellery with a particular weight and quality with other diamond jewellery of similar weight and quality to determine which has the better value.