GIA Here at Diamond Boutique our solitaire ring purchases will come with a report issued by the Gemological Institute of America (GIA). The GIA is an internationally renowned independent laboratory which confirms the quality of the diamonds against a strict classification system. We also have an in-house GIA qualified diamond grader who assesses all our stones individually to ensure they meet our strict diamond standards. We only use high quality diamonds that display incredible brilliance, fire and pattern.