GSI: Gemological Science International Diamond Certification
Defining Gemology In The Twenty-First Century
Expert-Designed Learning for the Jewelry Industry
About Us
Gemological Science International (GSI) was founded in 2005 in New York. This makes GSI the only major gemological organization established in the 21st century. GSI is a global company, with locations across four continents.
GSI is one of the largest gemological laboratories in the world by volume of goods we analyze. We set ourselves apart by leading the way with diamond and gemstone analysis and research.
Reports
GSI offers diverse grading reports to meet different client needs.
The Full Diamond Examination Report (FDX) provides detailed information on a diamond's 4Cs and parameters, including the plot.
Reports can be customized as per clients' requests.
Education
GSI firmly believes that trade and consumer education is critical to the long- term success of the diamond and jewelry industry.
The Knowledge Center offers a variety of educational initiatives for both the trade and general public.
Our Affiliations
Client Testimonials
Gaurav AnandManaging Director, Anand Jewels Indore Pvt. Ltd.
"We trust GSI's certification process for our Colored Stones, Diamonds as well as Polki jewelry."
T.M Abdul RahimExecutive Director, Sulthan Diamonds & Gold
"GSI's Quality Assurance(QA) service ensures our jewelry is inspected and passes the highest quality checks whereby we can assure our customers of high-quality jewelry they can trust."
Saurabh Gadgil Managing Director, P.N. Gadgil Jewellers
"GSI provides the essential gemological research the industry needs. We rely on GSI's expertise which strengthens our relationships with our customers."
Hemang Nensee Lead - Retail Capability Jewellery, Titan Company Ltd.
"Our collaboration with Gemological Science International (GSI) has played a key role in strengthening our promise. Their diamond and gemstone certification programs have equipped our frontline teams at Tanishq and Mia with deep product knowledge and confidence. GSI has also helped us shape compelling in-store narratives and customer education tools — enabling us to deliver a jewellery experience that’s rooted in authenticity, expertise, and care. We value this ongoing partnership and the shared commitment to building informed teams and confident customers. "
Student Testimonials
Shagun JainRatna Gems, Mumbai
“The CSP course was incredibly insightful, but the mine visit was truly the highlight. Nothing compares to hands-on learning. Thanks to the course, we are now expanding our business into gemstones, offering our customers a wider range of high-quality products. It has truly been a game-changer for us.”
Course: Colored Stone Professional
Rudraksh ChauhanMadhya Pradesh
“This course transformed the way I view gemstones. I now have a clear understanding of how to distinguish natural gemstones from synthetics. It’s a crucial skill that has reshaped how I approach my work and serve my clients.”
Course: Colored Stone Professional
Kamal LalPunjab
“I have learned so much in the CSP course that I was able to open a new showroom and testing center. The knowledge I gained has been the driving force behind my business expansion, helping me stand out in the industry.”
Course: Colored Stone Professional
Chirag JainJaipur
“The CSP course helped me see Gemstone in a whole new light. The faculty’s expertise made everything clear and practical. With my new skills, I have launched my own gemstone business, and it is already making a difference.”
Course: Colored Stone Professional
Deeksha UpadhayayJankidas Jewels, Delhi
“This comprehensive course is perfect for freshers as well as the experienced. I highly recommend this course to each one aspiring to become a gemologist.”
Course: Colored Stone Professional
Divyansh BaidBaid Trading Corporation
“This course has transformed me into a professional Gemologist. It has further widened the view and scope for my family run business.”
Course: Colored Stone Professional
Seema TatiwalaVirok By Tatiwalas
“There was so much new to learn and take back despite having 28 years of experience in this industry.”
Course: Colored Stone Professional
Senior Retail Sales ProfessionalRetail Chain Store, USA
“Even after several years selling diamond jewelry, the GSI course leveled up my expertise. The in-depth focus on the scientific differences and quality factors between natural and lab-grown diamonds has given me the confidence to answer even the most complex customer questions.”
Course: Diamond Essentials, Online
Performance and Development ManagerRetail Chain Store, USA
“Individuals who have completed GSI have resulted in a higher Average Sales Ticket/Price per transaction.”
Course: Diamond Essentials, Online