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Spiral structure in a Colombian emerald
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Insight
27.06.2025
Sainte-Marie-aux-Mines 2025: 60 Years of Passion for Minerals and Gems
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Micrographs
25.06.2025
Negative quartz crystals in colourless quartz
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Insight
23.06.2025
A Visit to Cartier at the V&A: When Gemmologists Go to the Museum
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17.06.2025
Restoring the beauty of emeralds: our exclusive cleaning and oiling method
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Publication
12.06.2025
Coloured glass coating of quartz beads before the 13th century: An undocumented sapphire imitation
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Micrographs
11.06.2025
Octahedral sylvite crystals in a Colombian emerald
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Insight
07.06.2025
GGTL Laboratories at EPHJ 2025: networking and innovation
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Micrographs
28.05.2025
Trigons on the surface of a green diamond crystal
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Insight
26.05.2025
Throwback to GemGenève 2025
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Micrographs
14.05.2025
Mica crystals inside an emerald, Kafubu, Zambia.
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Insight
10.05.2025
GGTL Laboratories Switzerland at GemGenève: Thank You for Stopping By!
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Insight
01.05.2025
DFI V3: the tool for identifying synthetic diamonds – on display at GemGenève
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Navigation SM
About us
Services
Main services
Diamond services
Gem services
Pearl services
Exclusive services
Cleaning and sorting of chemically-unset melee diamonds
Cleaning & oiling of emeralds
Coral species identification
Cullinan report
Consulting
Publications
T. Hainschwang
F. Notari
C. Caplan
F. Blumentritt
Other
Diploma (D.U.G.)
Products
News
Contact
en
fr