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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.

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.

Three light-to-medium blue carved sculptures sit in a line – from larger to smaller.

Article

Making the Cut: The Art and Science of Fantasy Carving

Sharon Bohannon, January 10, 2020

Gem cutters - whether “gem whisperers” or mathematicians - create breathtakingly artistic individual gems and sculptures.

Article

Diamonds Under the Scope

Sharon Bohannon, April 11, 2016

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

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.

An Interesting Rose Quartz from Madagascar

John I. Koivula, December 9, 2013

A new find of rose quartz from Madagascar contained some unusual inclusions.

Bismuthinite inclusions in rose quartz from Madagascar

Jaroslav Hyrsl, December 9, 2013

Inclusions visible to the naked eye are common in almost all varieties of quartz apart from rose quartz.

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.

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.

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.

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