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Spiral structure in a Colombian emerald
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Insight

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Tiny guest oriented inclusions with biotite crystal inclusions in a peridot from Myanmar
Micrographs

Tiny guest oriented inclusions with biotite crystal inclusions in a peridot (forsterite) from Myanmar

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Melee-sized coloured sapphires
Publication

Efficiently Testing Melee-Sized Coloured Stones

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Welcome sign and Mogok seen from the view point.
Insight

Mogok : The Valley of Precious Stones

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Cobaltocalcite or cobaltoan calcite
Publication

Cobaltocalcite or cobaltoan calcite: A Swiss answer

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Pyrochlore automorphous crystal and comet tail in a blue sapphire-NTE
Micrographs

Automorphous pyrochlore crystal and comet tail in a sapphire (nte)

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Cavity filling (C2) - Mong Hsu-Myanmar
Micrographs

Cavity filling (C2) in a ruby from Mong Hsu, Myanmar

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Bubbles in epoxy resin, emerald from Chivor, Colombia (darkfield illumination)
Micrographs

Bubbles in epoxy resin in an emerald from Chivor, Colombia (darkfield illumination)

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Garnet inclusion in type Ia diamond (darkfield illumination)
Micrographs

Garnet inclusion in type Ia diamond (darkfield illumination)

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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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