A certificate is a blue print of a loose diamond. Wholesalers, retailers and consumers know a certificate as either a diamond grading report or a diamond dossier. A certificate reports a diamond’s exact measurements, weight, cut and overall quality. A certificate points out a diamond’s individual characteristics and is a very useful tool for identifying a stone. When shopping for a loose diamond, keep in mind that stones that have a grading report will help you make an informed decision on the diamond that is right for you.