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Describing 58-facet Round Brilliant-Cut Diamonds at GIA

Many beautiful older diamonds are cut to different proportions than modern round brilliants, which makes them a challenge to grade according to modern cut conventions. This article describes how the GIA accommodates these historic gems.

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Article
Famous Diamonds Examined by GIA

An aura of mystery has always surrounded these natural wonders, so it was quite an honor when GIA researchers examined these famous diamonds.

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A diagram uses four rulers to show how color, clarity, cut and carat weight are measured.
Article
Diamond Quality: A Short History of the 4Cs

You’ve heard about the 4Cs of diamond quality (color, clarity, cut, carat weight). But how did they become so well-known? Here’s a little diamond history.

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Article
How Does Light Affect How My Diamond Looks?

How – and where – you look at your diamond can greatly change its appearance.

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Pearl farm on the Indonesian island of Lombok
Bead-Cultured and Non-Bead-Cultured Pearls from Lombok, Indonesia

Documents the retrieval and testing of P. maxima cultured pearls from a Lombok hatchery.

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The Wittelsbach Blue

This article describes what is known about the Wittelsbach Blue since it was first reported in 1666, and the gemological information released to date on this diamond.

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Nanocut Plasmaetched Diamonds
Cutting Diffraction Gratings to Improve Dispersion (“Fire”) in Diamonds

A new microlithography process developed to create high-resolution diffraction grating patterns on portions of certain facets can improve the dispersion of light and thus the amount of “fire” in a diamond.

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Color bars on top and sides of 3,019 ct rough opal
The Challenges of Cutting a Large Gem Opal Rough

A first-person account of cutting a 3,019 ct piece of white opal to create a 1,040 ct gem with play-of-color across the surface.

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A wide range of jewelry pieces with the round brilliant diamond cut
A Foundation for Grading the Overall Cut Quality of Round Brilliant Cut Diamonds

The GIA diamond cut grading system described here includes the components of brightness, fire, scintillation, polish, and symmetry, as well as weight and durability concerns, into a single overall grade for cut quality for standard round brilliants.

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imperial flame topaz
Article
Cutting the ‘Imperial Flame’ Topaz

See how gem artist Alexander Kreis transforms a rough topaz crystal into a gem cutting masterpiece.

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