News

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

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

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The heat treatment of corundum at Moderate temperature
Micrographs, Research

The heat treatment of corundum at Moderate temperature

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Precious corals, C. rubrum, P. elatius, C. japonicum, C. konojoi, H. laauense, Coll. SGDF, Photograph M.Rondeau
Research

Review and update of the classification of precious corals.

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New Large Black Synthetic Moissanite as a Black Diamond Imitation
Research

New Large Black Synthetic Moissanite as a Black Diamond Imitation

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An Ethiopian cup in rhinoceros horn (1/2)
Research

An Ethiopian cup in rhinoceros horn (1/2)

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Melee-sized coloured sapphires
Research

Efficiently Testing Melee-Sized Coloured Stones

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Cobaltocalcite or cobaltoan calcite
Research

Cobaltocalcite or cobaltoan calcite: A Swiss answer

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“Boehmite Needles” in Corundum Are Rose Channels
Micrographs, Research

“Boehmite Needles” in Corundum Are Rose Channels

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A Lalique quartz pendant in polarized light
Research

A Lalique quartz pendant in polarized light

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Beads cut from gastropod mollusc shell disguised in a coral necklace
Research

Beads cut from gastropod mollusc shell disguised in a coral necklace

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Multi-treated HPHT-grown synthetic diamonds
Micrographs, Research

HIH: Multi-treated HPHT-grown synthetic diamonds showing some characteristics of natural diamonds

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Natural pearls of the Veneridae family
Research

Natural pearls of the Veneridae family

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