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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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Iridescence in a rainbow andradite from Nara in Japan, moiré pattern
Micrographs

Iridescence in a rainbow andradite from Nara in Japan

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Laboratory Alert! Melee-sized HPHT Treated Yellow Diamonds appear in the Market
Publication

Lab Alert! Melee-sized HPHT Treated Yellow Diamonds appear in the Market

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Flame pattern in a non-nacreous natural pearl from Aliger gigas
Micrographs

Flame pattern in a non-nacreous natural pearl from Aliger gigas

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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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Natural glass inclusions in the form of atolls in an unheated ruby
Micrographs

Natural glass inclusions in the form of atolls in an unheated ruby

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Formation of synthetic spinel in a heated sapphire
Micrographs

Formation of synthetic spinel in a heated sapphire

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Mica inclusions in a Russian emerald
Micrographs

Mica inclusions in a Russian emerald

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Colour zonations in a "solid CO2-rich" diamond
Micrographs

Colour zonations in a "solid CO2-rich" diamond

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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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