With locations in Los Angeles, New York, Israel, India, Belgium and Hong Kong, GGS is globally equipped to be your source for diamond and jewelry knowledge. Based on our international acclaim in the Grading and Appraising industry, GGS is a leading presence worldwide when it comes to diamond and gem certification and appraisal. To request your own detailed appraisal from GGS, please fill out our contact form and we will get back to you shortly.