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Spiral structure in a Colombian emerald
Negative quartz crystals in colourless quartz
Micrographs
25.06.2025

Negative quartz crystals in colourless quartz

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Octahedral sylvite crystals in a Colombian emerald
Micrographs
11.06.2025

Octahedral sylvite crystals in a Colombian emerald

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Trigons on the surface of a green diamond crystal.
Micrographs
28.05.2025

Trigons on the surface of a green diamond crystal

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Mica crystals inside an emerald, Kafubu, Zambia.⁠ ⁠
Micrographs
14.05.2025

Mica crystals inside an emerald, Kafubu, Zambia.

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Disordered carbon in cryptocrystalline fuchsite from Ya'an, Sichuan, China.⁠
Micrographs
01.05.2025

Disordered carbon in cryptocrystalline fuchsite from Ya'an, Sichuan, China

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Cultured pearls seen under X-rays
Micrographs
23.04.2025

Cultured pearls seen under X-rays

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Calcite crystals in NTE ruby from Mogok, Myanmar.⁠ ⁠
Micrographs
16.04.2025

Calcite crystals in NTE ruby from Mogok, Myanmar.

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24.21-carat yellow sapphire with characteristics similar to those found in Madagascar-origin sapphires
Micrographs
12.03.2025

A 24.21-carat yellow sapphire with characteristics similar to those found in Madagascar-origin sapphires

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Iridescence in a rainbow andradite from Nara in Japan, moiré pattern
Micrographs
31.01.2025

Iridescence in a rainbow andradite from Nara in Japan

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Flame pattern in a non-nacreous natural pearl from Aliger gigas
Micrographs
19.01.2025

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

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Natural glass inclusions in the form of atolls in an unheated ruby
Micrographs
21.09.2024

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
21.09.2024

Formation of synthetic spinel in a heated sapphire

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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

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