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Venetian mask cloud inclusion
Article
Diamonds Under the Scope

Peer through a microscope and discover another world of gems. Inclusions reveal the gem’s journey from deep within the earth to its surface.

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Rough diamond, yellow in colour
Article
Diamond Research Gives Clues to the Formation of the Continents

Mineral inclusions trapped in diamonds reveal the continents’ construction – and help GIA researchers date diamonds.

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Raman analysis identified the horse-shaped inclusion as phlogopite mica.
A Horse-Shaped Inclusion in Pink Sapphire from Mozambique

Microscopic examination of a Mozambican pink sapphire reveals an inclusion with a surprising shape and composition.

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Topaz from Pakistan with microlite inclusions.
Microlite Crystals in Topaz from Pakistan

Aesthetically pleasing inclusions are found in topaz from Pakistan’s Shigar Valley.

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Merelaniite whisker inclusions in tanzanite.
Merelaniite Inclusions in Tanzanite

A recently identified mineral is found, in whisker-like form, in a gem-quality tanzanite host.

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Mushroom in Mexican Copal
Mushroom in Copal

A Mexican copal plays host to a well-preserved mushroom.

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Six-rayed star in an untreated spinel.
Star Spinel with Four and Six Rays

A cabochon displaying asterism is found to be an untreated spinel with two different stars.

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Burmese phenakite with perettiite-(Y) bundles (left) and tusionite inclusions (right).
Perettiite-(Y) and Tusionite Inclusions in Phenakite from Myanmar

Seldom-seen inclusions are found in a host material that is rare in its own right.

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Suite containing over 36 carats of Yogo sapphire
Gemmological Characterisation of Sapphires from Yogo Gulch, Montana

A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.

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Fancy Dark brown to Fancy black Marange diamonds
Black Diamonds from Marange (Zimbabwe): A Result of Natural Irradiation and Graphite Inclusions

Characterises a suite of 40 natural brown to black diamonds from this deposit so that they can be distinguished from suspected treated black diamonds.

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