Your
gemstones
unveiled

  • Asteriated luminescent structure in a rough diamond
    Asteriated luminescent structure in a rough diamond
  • Bi-colour luminescent structure in a rough diamond
    Bi-colour luminescent structure in a rough diamond
  • Rose channels in a sapphire from Umba Valley, Tanzania
    Rose channels in a sapphire from Umba Valley, Tanzania
  • Crystals in a coloured diamond
    Crystals in a coloured diamond
  • Healed fracture in a heated magmatic sapphire
    Healed fracture in a heated magmatic sapphire
  • Structure of a pearl from Pinna nobilis
    Structure of a pearl from Pinna nobilis

Your
gemstones
unveiled

Asteriated luminescent structure in a rough diamond

Our services

Diamond services

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

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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.

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

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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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