About Gemological Science International Where Science Meets Trust

Founded in 2005 in New York, Gemological Science International (GSI) is one of the world's leading gemological organizations, dedicated to advancing diamond and gemstone grading through innovation, technology, and scientific research. Operating across multiple continents, GSI provides trusted certification, quality assurance, gemstone identification, and educational services to retailers, manufacturers, wholesalers, and consumers worldwide. With a commitment to accuracy, transparency, and ethical practices, GSI combines state-of-the-art technology with expert gemological knowledge to deliver reliable and consistent results. Guided by its core pillars—Integrity, Innovation, Professional Service, and Research & Education—GSI continues to shape the future of the global gem and jewelry industry while building confidence and trust throughout the supply chain.