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Spiral structure in a Colombian emerald
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Two-phase inclusions in an emerald from Zambia
Micrographs

Two-phase inclusions in an emerald from Zambia

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Diamond compared to 5 CHF
Insight

Small stones. Big responsibility.

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Ferric and other compounds in biotite from India
Micrographs

Ferric and other compounds in biotite from India

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Ottu sapphie
Publication

A REMARKABLE "OTTU" SAPPHIRE AT THE LABORATORY

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Batavian tears
Publication

Batavian tears: a gemmological look at glass under extreme tension

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Remarkable capillary inclusions in a yellow synthetic diamond (green emitter) grown using HPHT method.
Micrographs

Remarkable capillary inclusions in a yellow synthetic diamond (green emitter) grown using HPHT method.

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Vesuvianite
Publication

Discover a newly documented vesuvianite deposit

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machine
Insight

Mass vs weight in gemmology: why “1 carat” is a mass

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Synthetic diamonds certification
Insight

Synthetic diamonds certification at GGTL Labratories Switzerland

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A non-copper-bearing elbaite tourmaline
Publication

Throwback to a remarkable non-copper-bearing elbaite tourmaline

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Synthetic rhodochrosite.
Micrographs

Synthetic rhodochrosite

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a tungsten carbide mortars
Insight

Introducing Tungsten carbide mortars

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