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Spiral structure in a Colombian emerald
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An exceptional 9.89 carats photochromic zircon
Publication

An exceptional 9.89 carats photochromic zircon

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A jewel with a large number of flux-grown synthetic rubies
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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, Publication

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
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Review and update of the classification of precious corals.

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New Large Black Synthetic Moissanite as a Black Diamond Imitation
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New Large Black Synthetic Moissanite as a Black Diamond Imitation

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Melee-sized coloured sapphires
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Efficiently Testing Melee-Sized Coloured Stones

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Cobaltocalcite or cobaltoan calcite
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Cobaltocalcite or cobaltoan calcite: A Swiss answer

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

“Boehmite Needles” in Corundum Are Rose Channels

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Origine et croissance des minéraux des fissures alpines dans les Alpes suisses occidentales
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Origin and growth of alpine fissure minerals in the western Swiss Alps: record of fluid flow during exhumation

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A Lalique quartz pendant in polarized light
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A Lalique quartz pendant in polarized light

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

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Multi-treated HPHT-grown synthetic diamonds
Micrographs, Publication

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

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