GSI certification is the industry standard for diamonds. GSI certification adheres to the strict requirements put forth by Gemological Science International. GSI diamonds are identified by trained experts who use advanced equipment and a strict process to ensure their quality. This fact alone separates Gemological Science International form others in the diamond grading industry because it is the only company to offer these services together. If you are shopping for a diamond, jewelry, or gemstone, make sure your piece is a certified GSI diamond. A GSI certification grading report can be made for every diamond.