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 geographical origin.
Welcome to GGTL Laboratories. An experienced laboratory like no other where science, technology, and research ally to give you the best of gemmology.
The unusual case of a jewel with a large number of flux-grown synthetic rubies sold as natural rubiesRead
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