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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

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

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Raman analysis identified the horse-shaped inclusion as phlogopite mica.
A Horse-Shaped Inclusion in Pink Sapphire from Mozambique

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

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Suite containing over 36 carats of Yogo sapphire
Gemmological Characterisation of Sapphires from Yogo Gulch, Montana

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

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Multi-colored gems are superimposed on an image of glacier peaks.
Article
Gems and Minerals from the Sub-Arctic

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

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Three pieces of labradorite with yellow, blue and green flashes of color.
Article
Optical Effects of Phenomenal Cabochons

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

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Fall 2016 Gems & Gemology Cover
Article
Autumn 2016 G&G: CVD Synthetic Diamonds Survey, Reversible Colour Change in Blue Zircon

A summary of the content found in the Autumn 2016 issue of Gems & Gemology.

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Phase changes in sapphire
A Fantastic Display of Phase Changes in a Sapphire’s Fluid Inclusion

Phase changes illustrate the temperature and pressure conditions in the fluid inclusion system of a Sri Lankan sapphire.

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Violetish blue spinel inclusion in sapphire.
Violetish Blue Spinel in Yellow Sapphire

A singly refractive inclusion within a yellow sapphire proves to be spinel.

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Article
Summer 2015 G&G: Dual-Stars, Photomicrography Guide, Rubies from Tajikistan, New Micro-World Section

G&G Brief presents an overview of the content of the Summer 2015 issue of Gems & Gemology.

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Article
Insights From Inclusions

Natural gemstones are typically far more valuable than synthetic ones, so being able to identify them correctly is a powerful skill.

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