Article Search Results

Reversible lamellar twinning under gentle pressure.

Reversible Twinning in Neodymium Pentaphosphate

Nathan Renfro and John I. Koivula, July 22, 2020

Application of slight pressure perpendicular to the twinning planes reveals the unusual property of this synthetic gem.

Angular milky cloud shows spectral colors.

Phenomenon Resembling Play-of-Color in Sapphire

Britni LeCroy, July 22, 2020

Subtle tilting of the unheated sapphire revealed a noteworthy phenomenon resembling play-of-color, which is most commonly seen in precious opal.

Quarterly Crystal: Unknown Inclusion in Triphane Spodumene

John I. Koivula and Nathan Renfro, July 22, 2020

Afghani spodumene hosts an unidentified translucent orange crystal surrounded by an iridescent cleavage halo.

Brownish red staurolite crystal in ruby host.

Staurolite in Ruby

E. Billie Hughes, July 22, 2020

Conspicuous bright brownish red crystals in ruby matrix are the first recorded observations of staurolite in corundum.

Dark orange triplite inclusion in beryl.

Triplite in Beryl

E. Billie Hughes, July 22, 2020

Orange crystal inclusion identified as the rare mineral triplite in a beryl from Pakistan.

Pallasitic peridot from the Jepara meteorite.

Pallasitic Peridot with Iridescent Needle-Like Inclusions

Nathan Renfro, July 22, 2020

Numerous needle-like inclusions exhibit vibrant interference colors in a suite of pallasitic peridot from the Jepara meteorite.

A blue diamond with inclusions under the table is held up in tweezers.

Article

Where Do Blue Diamonds Come From? Blue Diamonds Have a Surprising “Superdeep” Origin and a Link to Ancient Oceans

Evan M. Smith, August 1, 2018

This is an extended abstract of the article ‘Blue boron-bearing diamonds from Earth’s lower mantle,’ published in the 2018 August issue of Nature. GIA Researcher Evan Smith is the lead author of the article.

Article

Large, Rare Diamonds Reveal the Inner Workings of Earth’s Mantle

GIA, December 16, 2016

This is an extended abstract of the article ‘Large Gem Diamonds From Metallic Liquid in Earth’s Deep Mantle,’ published on December 16, 2016 in Science magazine. GIA Postdoctoral Research Fellow Evan Smith is the lead author of the article.

Article

Diamond Growth from C–H–N–O Recycled Fluids in the Lithosphere: Evidence from CH₄ Micro-inclusions and δ¹³C–δ¹⁵N–N Content in Marange Mixed-habit Diamonds

Karen V. Smit^a, November 15, 2016

Article was published in Lithos Volume 265, 68-81.

Article

Type Ib Diamond Formation and Preservation in the West African Lithospheric Mantle: Re–Os Age Constraints from Sulphide Inclusions in Zimmi Diamonds

Karen V. Smit^a, October 27, 2016

Article published in Precambrian Research 286, 152-166.

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