GIA is considered the world's most trusted name in diamond grading and gemstone identification. Since 1931, GIA has been dedicated to ensuring the public trust in gems and jewelry by upholding the highest standards of integrity, academics, science, and professionalism. It is the corporate birthplace of the International Diamond Grading System™ and the creator of the famous 4Cs of diamond value – color, clarity, cut, and carat weight.
If you wish to have more information about the services of the GIA Laboratory in America, please click here: GIA Laboratory

Retailers and consumers can check the information on any GIA Diamond Grading Report or Diamond Dossier issued since Jan. 1, 2000 by visiting the Institute's website at Report Check

The new, free online Report Check service will be valuable for anyone who wants to confirm that the grading information in their Diamond Grading Report or Diamond Dossier is consistent with the information stored in the GIA database. The service is available by entering the GIA report number and weight of the diamond, and will provide all of the critical information on the original report—including a cut grade when available.