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Three pieces of labradorite with yellow, blue and green flashes of color.

Article

Optical Effects of Phenomenal Cabochons

Sharon Bohannon, November 11, 2016

Learn how the structure, inclusions and properties of some gemstones interact with light to create unusual visual effects.

A row of various shaped cut and polished pink diamonds.

Article

Why are Pink Diamonds Pink? GIA Researchers Dive Deep into their Crystal Structure

Russell Shor, October 18, 2019

GIA researchers analysed more than 90,000 natural pink diamonds to better understand how these rare and beautiful diamonds formed and got their colour.

Multi-colored gems are superimposed on an image of glacier peaks.

Article

Gems and Minerals from the Sub-Arctic

Sharon Bohannon, March 17, 2017

Circumnavigate the boreal reaches of the globe to explore gems from polar regions.

The Very Deep Origin of the World’s Biggest Diamonds

Evan M. Smith, Steven B. Shirey, and Wuyi Wang, November 8, 2017

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

Emerald crystals from Colombia, Afghanistan, and Zambia

Photoluminescence Spectra of Emeralds from Colombia, Afghanistan and Zambia

D. Brian Thompson, Christian J. Bayens, Matthew B. Morgan, Taylor J. Myrick, and Nealey E. Sims, November 8, 2017

Compares PL spectroscopy data of 48 emerald samples from three countries to evaluate the usefulness of the technique in geographic origin determination.

Iridescence in iris quartz from Jalgaon, India

Causes of Iridescence in Natural Quartz

Xiayang Lin and Peter J. Heaney, May 8, 2017

Describes the occurrence of iridescence, and the role of differential etching, in quartz crystals from India’s Jalgaon District.

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