GTL :: The GIA Gem Trade Laboratory – The gemological grading institution that was created by GIA. They offer identification and quality grading reports for any gem material. Their grading is considered the most consistent and conservative, along with AGSL, the labs created by AGS.

They offer two primary reports, the Diamond Dossier and the more complete Diamond Grading Report ::

GIADiamondDossier

GIADiamondGradingReport