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Spiral structure in a Colombian emerald
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Micrographs
01.04.2021
Synthetic flame-fusion colour-change sapphire seen under laser excitation
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Micrographs
04.03.2021
Synthetic flame-fusion synthetic colour-change sapphire seen under laser excitation
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Micrographs
11.02.2021
HPHT synthetic yellow diamond, luminescence under strong SWUV irradiation
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Micrographs
21.01.2021
Pyramidal tops of quartz embedded in beige chalcedony
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Insight
17.12.2020
Happy Birthday, GemAlliance!
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Micrographs
12.11.2020
High-temperature heated blue sapphire from Sri Lanka
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Insight, Micrographs
01.11.2020
A "Maltese Cross" pattern seen in a natural diamond viewed with GGTL DFI System
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Micrographs
26.10.2020
Naturally healed fracture, with residual liquid film and negative crystal with altered inclusion in a purplish red sapphire from Sri Lanka.
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Micrographs, Research
19.10.2020
The heat treatment of corundum at Moderate temperature
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Micrographs
05.10.2020
Turquoise crystals, Beauvoir, Echassière, Ebreuil, Allier-Auvergne, France
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Insight
02.10.2020
From now, all GGTL reports will be exclusively in English.
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Research
02.10.2020
Review and update of the classification of precious corals.
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About us
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Recovery of melee diamonds
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