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News

Spiral structure in a Colombian emerald
A jewel with a large number of flux-grown synthetic rubies
Research
12.05.2021

The unusual case of a jewel with a large number of flux-grown synthetic rubies sold as natural rubies

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Synthetic flame-fusion colour-change sapphire seen under laser excitation
Micrographs
01.04.2021

Synthetic flame-fusion colour-change sapphire seen under laser excitation

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Amazing synthetic flame-fusion synthetic colour-change sapphire seen under laser excitation
Micrographs
04.03.2021

Synthetic flame-fusion synthetic colour-change sapphire seen under laser excitation

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HPHT synthetic yellow diamond, luminescence under strong SWUV irradiation
Micrographs
11.02.2021

HPHT synthetic yellow diamond, luminescence under strong SWUV irradiation

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Pyramidal tops of quartz embedded in beige chalcedony
Micrographs
21.01.2021

Pyramidal tops of quartz embedded in beige chalcedony

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Happy Birthday, GemAlliance
Insight
17.12.2020

Happy Birthday, GemAlliance!

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High-temperature heated blue sapphire from Sri Lanka
Micrographs
12.11.2020

High-temperature heated blue sapphire from Sri Lanka

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A "Maltese Cross" pattern seen in a natural diamond viewed with GGTL DFI System
Insight, Micrographs
01.11.2020

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

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Naturally healed fracture, with residual liquid film and negative crystal with altered inclusion in a purplish red sapphire from Sri Lanka
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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The heat treatment of corundum at Moderate temperature
Micrographs, Research
19.10.2020

The heat treatment of corundum at Moderate temperature

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Turquoise crystals, Beauvoir, Echassière, Ebreuil, Allier-Auvergne, France
Micrographs
05.10.2020

Turquoise crystals, Beauvoir, Echassière, Ebreuil, Allier-Auvergne, France

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GGTL Certificates
Insight
02.10.2020

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

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  • About us
  • Services
    • Main services
      • Diamond services
      • Gem services
      • Pearl services
    • Exclusive services
      • Recovery of melee diamonds
      • Cleaning & oiling of emeralds
      • Coral species identification
      • Cullinan report
    • Consulting
  • Products
  • News
  • Contact
  • en
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