My husband and I started to cooperate with the GSI Diamond
grading company for last several years. We're entirely satisfied with their approach to work! During all working period, we have had no problems and GSI has established itself as a dependable and trustworthy organization! All experts have many years of experience in the gemological industry. GSI takes transparency so seriously, they have numerous instruments in place that allow customers to virtually peek inside the laboratory. They have a wide variety of formats for reports which can depend on your needs. I can recommend them!