GLI Gemological Laboratories Institute
Gemological Laboratories Institute




About Us

GLI prides itself on being one of the best in high volume certification. Our customers service top retailers around the world which base their business on credibility, accuracy, affordability and speed. Amazing turn around time allows our customers to have certified product in their stores to provide full stock levels at all times without delays. Our head office and main facility is in Chiang Mai, Thailand. Servicing retail and wholesale customers in the United Kingdom, United States and Canada.


Get in touch

100 M.8 Sanphafai-Baanthi Rd., T.Baanklang A.Muang Lamphun 51000 Thailand



Why GLI?

With hundreds of thousands of choices worldwide for gemological services, GLI had to find a way to make a difference for customers to find its place in the market. Being that an appraisal is a subjective opinion, your ability and reputation is what will build your business.

GLI has done just that and has been able to formalize a certification process to make it affordable for retailers to certify smaller and larger diamonds without affecting the retail prices. Some certification costs don’t allow for this as their costs would dramatically alter the price point of items making certification not cost effective. GLI’s vision has always been to provide certification at a very reasonable cost, with massive amounts of volume they can afford to keep costs low without compromising standards. Thousands of cert’s worldwide, we now have a proven track record and many satisfied customers allowing all customers access to a certification.

GLI has grown substantially over the last few years. We now have our certificates around the world with Major retailers. Our certs are recognized in all 3 majors retailers in Canada, 3 of the top US and 2 of the top UK along with selected customers in Europe and Asia.