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A face-up view of a cushion cut diamond with blue color.

Article

Gems & Gemology’s 7 Most Unusual Encounters from 2019

Stuart Overlin, Brooke Goedert and Kellie Giordano, December 13, 2019

Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.

Article

Diamond Research Gives Clues to the Formation of the Continents

Karen V. Smit, April 25, 2019

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

Burmese phenakite with perettiite-(Y) bundles (left) and tusionite inclusions (right).

Perettiite-(Y) and Tusionite Inclusions in Phenakite from Myanmar

Jaroslav Hyršl, August 9, 2018

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

Star Spinel with Four and Six Rays

E. Billie Hughes, August 9, 2018

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

Mushroom in Copal

Rebecca Tsang, August 9, 2018

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

Merelaniite whisker inclusions in tanzanite.

Merelaniite Inclusions in Tanzanite

Augusto Castillo, Tyler Smith, and John A. Jaszczak, August 9, 2018

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

Topaz from Pakistan with microlite inclusions.

Microlite Crystals in Topaz from Pakistan

Jaroslav Hyršl, August 9, 2018

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

Raman analysis identified the horse-shaped inclusion as phlogopite mica.

A Horse-Shaped Inclusion in Pink Sapphire from Mozambique

Charuwon Khowpong, August 9, 2018

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

Fancy Dark brown to Fancy black Marange diamonds

Black Diamonds from Marange (Zimbabwe): A Result of Natural Irradiation and Graphite Inclusions

Karen V. Smit, Elina Myagkaya, Stephanie Persaud, and Wuyi Wang, August 6, 2018

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

Suite containing over 36 carats of Yogo sapphire

Gemmological Characterisation of Sapphires from Yogo Gulch, Montana

Nathan D. Renfro, Aaron C. Palke, and Richard B. Berg, August 6, 2018

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

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