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Spiral structure in a Colombian emerald
Jardin d’Hiver 2025 at GGTL Laboratories Switzerland
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Jardin d’Hiver 2025 at GGTL Laboratories Switzerland

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Féodor Blumentritt Speaks on Gem Treatments at the XXI Rendez-Vous Gemmologiques de Paris
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Féodor Blumentritt Speaks on Gem Treatments at the XXI Rendez-Vous Gemmologiques de Paris

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Gemmology books
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Gem books you absolutely need to read!

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Atelier de gemmologie à la Haute Ecole Arc - HES-SO : Retour sur un événement enrichissant
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Gemology workshop at Haute Ecole Arc - HES-SO: A look back at an enriching event

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Cover of the 4th Issue of Gemmes
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GGTL Laboratories: Official Sponsor of GEMMES Magazine – Announcement of the 4th Issue

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Genève
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GGTL Laboratories Switzerland visiting presence at GemGenève

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The city of Nantes
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40th Anniversary of the first DUG Diploma

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GGTL Laboratories Switzerland at Watches & Wonders
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GGTL Laboratories Switzerland visit at Watches & Wonders

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Couverture du magazine Gemmologie et Francophonie
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Discover the issue 3 of GEMMES: Celebrating spring and francophonie!

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Happy Birthday, GemAlliance
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Happy Birthday, GemAlliance!

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A "Maltese Cross" pattern seen in a natural diamond viewed with GGTL DFI System
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A "Maltese Cross" pattern seen in a natural diamond viewed with GGTL DFI System

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GGTL Certificates
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From now, all GGTL reports will be exclusively in English.

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