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Spiral structure in a Colombian emerald
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Flame pattern in a non-nacreous natural pearl from an unknown mollusc
Micrographs

Flame pattern in a non-nacreous natural pearl from an unknown mollusc

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Blue residues and gas in bubbles in synthetic sapphire
Micrographs

Blue residues and gas in bubbles in green synthetic quench-cracked flame fusion sapphire

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Ruby from Cambodia
Micrographs

Ruby from Cambodia (TE2): Light interference in a thin fracture containing artificial glassy material

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GemAlliance welcomes its 5th member: the LFG
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GemAlliance welcomes its 5th member: the LFG

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

“Boehmite Needles” in Corundum Are Rose Channels

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GemAlliance welcomes its 4th member: the JGGL
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GemAlliance welcomes its 4th member: the JGGL

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AIGS & GGTL announce the launch of GemAlliance
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AIGS & GGTL announce the launch of GemAlliance

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Origine et croissance des minéraux des fissures alpines dans les Alpes suisses occidentales
Publication

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
Publication

A Lalique quartz pendant in polarized light

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

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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Natural pearls of the Veneridae family
Publication

Natural pearls of the Veneridae family

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