Asteriated luminescent structure in a rough diamond

Our services

Diamond services

We provide grading and analytical reports for both loose and mounted diamonds.


Coloured gemstone services

With more than 20 years of expertise, we can guide you through the world of gemstones by uncovering authenticity, treatment, and the geographical origin.


Exclusive services

What makes us special besides our expertise?
Our exclusive services.


GGTL laboratories

Welcome to GGTL Laboratories, an experienced laboratory like no other where science, technology, and research ally to give you the best of gemmology.

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Get in touch and stay tuned! We will give you a sneak peek into the life at the lab : gem curiosities, hot topics and remarkable discoveries.

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