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Spiral structure in a Colombian emerald
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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.
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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
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Epigenetic polycrystalline boehmite nestled in a fissure of an unheated purple metamorphic sapphire

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Inclusions de cinabre dans une opale éthiopienne
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Cinnabar Inclusions in Ethiopian Opal

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Une coupe ethiopienne en corne de rhinoceros
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An Ethiopian cup in rhinoceros horn (1/2)

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Coupe éthiopienne en corne de rhinocéros
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An Ethiopian cup in rhinoceros horn (2/2)

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An exceptional 9.89 carats photochromic zircon
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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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Synthetic flame-fusion colour-change sapphire seen under laser excitation
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Synthetic flame-fusion colour-change sapphire seen under laser excitation

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Amazing synthetic flame-fusion synthetic colour-change sapphire seen under laser excitation
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Synthetic flame-fusion synthetic colour-change sapphire seen under laser excitation

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HPHT synthetic yellow diamond, luminescence under strong SWUV irradiation
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HPHT synthetic yellow diamond, luminescence under strong SWUV irradiation

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