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Spiral structure in a Colombian emerald
Margarite crystals in an unheated ruby from Mozambique
Micrographs
03.01.2024

Margarite crystals in an unheated ruby from Mozambique

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Spherical gas bubbles in a cavity filled with epoxy resin in a Colombian emerald.
Micrographs
27.12.2023

Spherical gas bubbles in a cavity filled with epoxy resin in a Colombian emerald.

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Heat-treated bicolour sapphires from Shandong Changle, China
Micrographs
20.12.2023

Heat-treated bicolour sapphires from Shandong Changle, China

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Epigenetic polycrystalline boehmite nestled in a fissure of an unheated purple metamorphic sapphire
Micrographs
15.12.2023

Epigenetic polycrystalline boehmite nestled in a fissure of an unheated purple metamorphic sapphire

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Inclusions de cinabre dans une opale éthiopienne
Publication
01.07.2023

Cinnabar Inclusions in Ethiopian Opal

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Une coupe ethiopienne en corne de rhinoceros
Publication
01.07.2023

An Ethiopian cup in rhinoceros horn (1/2)

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Coupe éthiopienne en corne de rhinocéros
Publication
30.06.2023

An Ethiopian cup in rhinoceros horn (2/2)

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An exceptional 9.89 carats photochromic zircon
Publication
25.06.2023

An exceptional 9.89 carats photochromic zircon

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A jewel with a large number of flux-grown synthetic rubies
Publication
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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  • 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
  • Products
  • News
  • Contact
  • en
  • fr

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