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Spiral structure in a Colombian emerald
Unheated green sapphire from Anakie, Queensland, Australia
Micrographs

Unheated green sapphire from Anakie, Queensland, Australia

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Digitized cavities, containing crystals and gas bubbles in an emerald from Davdar, China
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Digitized cavities, containing crystals and gas bubbles in an emerald from Davdar, China

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Flat cavity containing a gas bubble in an unheated yellow sapphire from Sri-Lanka
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Flat cavity containing a gas bubble in an unheated yellow sapphire from Sri-Lanka

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Blue magmatic-related sapphire from Issoire, Puy-de-Dôme, France, unheated.
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Unheated blue magmatic-related sapphire from Puy-de-Dôme, France

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Margarite crystals in an unheated ruby from Mozambique
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Margarite crystals in an unheated ruby from Mozambique

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Spherical gas bubbles in a cavity filled with epoxy resin in a Colombian emerald.
Micrographs

Spherical gas bubbles in a cavity filled with epoxy resin in a Colombian emerald.

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Heat-treated bicolour sapphires from Shandong Changle, China
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Heat-treated bicolour sapphires from Shandong Changle, China

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Epigenetic polycrystalline boehmite nestled in a fissure of an unheated purple metamorphic sapphire
Micrographs

Epigenetic polycrystalline boehmite nestled in a fissure of an unheated purple metamorphic sapphire

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Inclusions de cinabre dans une opale éthiopienne
Research

Cinnabar Inclusions in Ethiopian Opal

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Une coupe ethiopienne en corne de rhinoceros
Research

An Ethiopian cup in rhinoceros horn (1/2)

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Coupe éthiopienne en corne de rhinocéros
Research

An Ethiopian cup in rhinoceros horn (2/2)

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An exceptional 9.89 carats photochromic zircon
Research

An exceptional 9.89 carats photochromic zircon

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