In order to verify the many different characteristics of a diamond, a diamond dossier or Diamond Certificate is provided with each diamond. There are many different companies that will provide a diamond certificate, but the Gemological Institute of America (GIA) is regarded as the most trusted source.
A GIA Certificate produces a document that lists all of the diamond’s many characteristics based on the rating system they developed for diamonds. Each diamond is rated by a large team of gemologists to determine the many characteristics using their trained eyes, a microscope, a jeweler’s loupe and other tools to complete the grading process. The GIA developed what is now the industry standard for diamond grading and identification.