Welcome to


We at GTLI continuously work upon gaining excellence and providing the best of services. Over the past few years we are able to attain good client base as GTLI certificates bring confidence when buying or selling diamonds, gemstones and jewelry. Our total commitment to understanding consumer concerns has motivated GTLI to develop comprehensive analysis and clear documentation for consumers. This empowers jewelry buyers to focus on finding precisely what they want, with full assurance in the integrity and quality of the GTLI certification.

GTLI believes that credibility is earned through experience, integrity, and reputation. The knowledge we have gained through decades of experience in the jewelry industry is our backbone.

Our especially

Eperts & Quality Testing

Welcome to Gemological testing lab. A new breed of certification organisation in certifying diamonds and gemstones.


To bring simplicity, clarity, choice and value to the process for buyer or for seller gem stones with highest quality assurance and quality verification of bespoke gemstones and Jewellery. We assure to provide reliable, fast and professional job.

GTLI Vision

Our vision is to achieve excellence in service and complete customer satisfaction. It’s all about providing the highest level of professionalism and services, to become the most preferred gemological laboratory.

GTLI Mission

We work hard to simplify the buying process, empower and educate our customers and ultimately help them make a purchase they will cherish for a lifetime with our quality gemstone grading certification called GTLI Certificate by Gemological Testing Lab

GTLI Value

GTLI places a premium not only on the quality of our grading expertise and customer service, but also on our values and high ethical standards. As we look to the future, GTLI must continue to be driven by those values of fairness and integrity with professional ethics.