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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

Characterizes 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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Walstromite inclusion with fan-shaped black fractures.
D-Color Natural IIa Diamond with Walstromite Inclusion

A diamond is proven to have a superdeep origin through an inclusion of CaSiO3-walstromite.

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Article
Diamond Fun Facts

Learn more about one of the Earth’s most fascinating creations, including some that became the most famous.

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Recent Advances in Understanding the Geology of Diamonds

Examines the last two decades’ advances in analyzing and understanding the formation of natural diamonds, and their relation to the earth’s formation.

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Man in a hard hat sits in an underground emerald mine.
Article
Geologist’s Newest Mission: Share the Love of Colored Gemstones

African-born colored stone specialist visits America and changes his life forever; finding love, earning GG and starting a new career.

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Rough CLIPPIR diamonds
The Very Deep Origin of the World’s Biggest Diamonds

Explores an exceptional family of diamonds, referred to as “CLIPPIR” (Cullinan-like, Large, Inclusion-Poor, Pure, Irregular, and Resorbed), that formed in a superdeep environment.

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Woman shines a light on huge crystals as she crawls among them.
Article
Gemologist Aims to Pique World’s Curiosity in Giant Crystals

‘Adventure seeker’ crawls through underground caves to reach and research giant selenite crystals – then shares her knowledge with the world.

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Wedding couple: Groom in black tuxedo and woman in white gown hold hands and gaze at one another. California hills in the background.
Article
Love in Tucson: The ‘Stars Aligned’ for Geologist and Designer at GIA Alumni Party

They met in line to get into the GIA Alumni Association Tucson party – and changed the course of their lives forever.

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Colombian independent miners
Colombian Emerald Industry: Winds of Change

A firsthand look at Colombia’s emerald mines and the cutting and trading industry in Bogotá.

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Husband and wife gaze happily at emerald rough found in a Colombian mine.
Article
Colombian Emerald Industry: Winds of Change

Andy Lucas, GIA’s education manager of field gemology, researches and documents the mine to market journey of gemstones. Lucas shares the changes he observed in Colombia’s major emerald mining and cutting areas in a presentation he made at the 2017 JCK Las Vegas show.

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