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Uniquely Cut Topaz
Article
Topaz Quality Factors

Learn about the factors that make topaz so desirable.

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Tourmaline
Article
Tourmaline Quality Factors

Learn about the factors that make tourmaline so desirable.

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Amethyst
Article
Amethyst Quality Factors

Learn about the factors that make amethyst so desirable.

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Alexandrite
Article
Alexandrite Quality Factors

Learn about the factors that make alexandrite so desirable.

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Peridot
Article
Peridot Quality Factors

Learn about the factors that make peridot so desirable.

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Article
Cut: The 4th C

GIA began issuing reports that included a cut grade for round brilliant diamonds in 2006 in an effort to establish standards for cut in the same manner as it has for color and clarity. This grading system is based on research conducted over the prior decade which was chronicled in several articles published in Gems & Gemology.

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Ruby and Sapphire Production and Distribution: A Quarter Century of Change
Ruby and Sapphire Production and Distribution: A Quarter Century of Change

During the past 25 years, the corundum market has been transformed from one of medium to high-priced gems to one that encompasses nearly all price ranges.

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Article
Begin with the End in Mind: Tips, Tools to Evaluate Diamond Rough

Guest speaker Chandra Horn shares the challenges artisanal miners face evaluating the quality of diamond rough and some tools to make it easier.

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Whitish Graining with an Amorphous Appearance
The Impact of Internal Whitish And Reflective Graining on the Clarity Grading of D-To-Z Color Diamonds at the GIA Laboratory

This article reviews the GIA Laboratory’s history of reporting on certain types of graining which are often the only characteristics present in large, high-clarity, high-color diamonds.

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Color Grading “D-to-Z” Diamonds at the GIA Laboratory

This article discusses the history and ongoing development of GIA's color grading system, and explains how its laboratory applies it.

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