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Spiral structure in a Colombian emerald
Negative quartz crystals in colourless quartz
Micrographs

Negative quartz crystals in colourless quartz

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Octahedral sylvite crystals in a Colombian emerald
Micrographs

Octahedral sylvite crystals in a Colombian emerald

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Trigons on the surface of a green diamond crystal.
Micrographs

Trigons on the surface of a green diamond crystal

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Mica crystals inside an emerald, Kafubu, Zambia.⁠ ⁠
Micrographs

Mica crystals inside an emerald, Kafubu, Zambia.

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Disordered carbon in cryptocrystalline fuchsite from Ya'an, Sichuan, China.⁠
Micrographs

Disordered carbon in cryptocrystalline fuchsite from Ya'an, Sichuan, China

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Cultured pearls seen under X-rays
Micrographs

Cultured pearls seen under X-rays

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Calcite crystals in NTE ruby from Mogok, Myanmar.⁠ ⁠
Micrographs

Calcite crystals in NTE ruby from Mogok, Myanmar.

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24.21-carat yellow sapphire with characteristics similar to those found in Madagascar-origin sapphires
Micrographs

A 24.21-carat yellow sapphire with characteristics similar to those found in Madagascar-origin sapphires

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Iridescence in a rainbow andradite from Nara in Japan, moiré pattern
Micrographs

Iridescence in a rainbow andradite from Nara in Japan

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Flame pattern in a non-nacreous natural pearl from Aliger gigas
Micrographs

Flame pattern in a non-nacreous natural pearl from Aliger gigas

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Natural glass inclusions in the form of atolls in an unheated ruby
Micrographs

Natural glass inclusions in the form of atolls in an unheated ruby

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Formation of synthetic spinel in a heated sapphire
Micrographs

Formation of synthetic spinel in a heated sapphire

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