News

Spiral structure in a Colombian emerald
Zircon dramatically altered by high-temperature treatment
Micrographs

Zircon dramatically altered by high-temperature treatment

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dioptase
Insight

Dioptase: a deceptive green with emerald-like reflections

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Hydrogen-rich diamonds
Micrographs

Hydrogen-rich diamonds: rare crystals with star-like zoning

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Fin recouvrement de quartz synthétique incolore sur une plaque de quartz synthétique
Micrographs

Fine overgrowth of colourless synthetic quartz on a plate of synthetic quartz

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Sainte-Marie-aux-Mines 2025
Insight

Sainte-Marie-aux-Mines 2025: 60 Years of Passion for Minerals and Gems

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Negative quartz crystals in colourless quartz
Micrographs

Negative quartz crystals in colourless quartz

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Cartier at the V&A
Insight

A Visit to Cartier at the V&A: When Gemmologists Go to the Museum

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Restoring the beauty of emeralds: our exclusive cleaning and oiling method
Insight

Restoring the beauty of emeralds: our exclusive cleaning and oiling method

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Coloured glass coating of quartz beads before the 13th century: An undocumented sapphire imitation
Publication

Coloured glass coating of quartz beads before the 13th century: An undocumented sapphire imitation

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Octahedral sylvite crystals in a Colombian emerald
Micrographs

Octahedral sylvite crystals in a Colombian emerald

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salon EPHJ 2025
Insight

GGTL Laboratories at EPHJ 2025: networking and innovation

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Trigons on the surface of a green diamond crystal.
Micrographs

Trigons on the surface of a green diamond crystal

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