A diamond certificate, also known as diamond grading report, or diamond dossier, is crucial when purchasing a diamond. It gives an unbiased report from a team of gemologists. The report gives a professional opinion and analysis of the diamonds dimensions, clarity, polish, symmetry, and other characteristics. Some reputable laboratories include GIA (Gemological Institute of America), AGS (American Gem Society), as well as the other laboratories which include (EGL) European Grading Laboratories. Often stones which are certified will have a certificate number which can be laser inscripted onto the girdle of the stone for verification purposes.