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Spiral structure in a Colombian emerald
Precious corals, C. rubrum, P. elatius, C. japonicum, C. konojoi, H. laauense, Coll. SGDF, Photograph M.Rondeau
Research

Review and update of the classification of precious corals.

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Dendritic inclusions (mode of formation unknown) in an unheated dark blue magmatic-related sapphire
Micrographs

Dendritic inclusions in an unheated magmatic-related sapphire from Attapeu province, South Laos

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Bubbles in brownish epoxy resin in an emerald from Colombia, darkfield illumination
Micrographs

Emerald from Colombia whose cracks are filled with epoxy resin

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New Large Black Synthetic Moissanite as a Black Diamond Imitation
Research

New Large Black Synthetic Moissanite as a Black Diamond Imitation

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Blue anatase crystals in quartz from Brazil
Micrographs

Blue anatase crystals in a quartz from Brazil

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CO2 diamond slice, SGDF-5864, under UV excitation (220 nm). Micrograph Dr. T. Hainschwang
Insight

Conference on replay: Brown Diamonds, a new in-depth look at their properties and classification

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Brown Diamond
Insight

Webminar: Brown diamonds - A new in-depth look at their properties and classification

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1K followers on Instagram
Insight

1K followers on Instagram

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

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

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Une coupe ethiopienne en corne de rhinoceros
Research

Une coupe ethiopienne en corne de rhinoceros (1/2) (version française)

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An Ethiopian cup in rhinoceros horn (1/2)
Research

An Ethiopian cup in rhinoceros horn (1/2) (English version)

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Melee-sized coloured sapphires
Research

Efficiently Testing Melee-Sized Coloured Stones

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