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Optimizing Face-Up Appearance in Colored Gemstone Faceting

How contrast patterns can increase perceived brightness and optimize a gemstone's appearance.

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Accurate Reporting of Key Trace Elements in Ruby and Sapphire Using Matrix-Matched Standards

Presents a group of corundum standards developed by GIA to improve the accuracy and efficiency of its laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) instruments.

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Three cultured pearls, one natural
Real-Time Microradiography of Pearls: A Comparison Between Detectors

Compares the image quality provided by real-time microradiographic imaging (RTX) units fitted with two different detectors: an image intensifier (II) and a flat panel detector (FPD).

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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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Portable Instruments and Tips on Practical Gemology in the Field

Buying gems or jewelry can be challenging even when one has access to a fully equipped lab.

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De Beers Natural versus Synthetic Diamond Verification Instruments

Two instruments have been developed at De Beers DTC Research Centre, Maidenhead, to distinguish synthetic diamonds from natural diamonds.

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Diamond Grit-Impregnated Tweezers: A Potentially Destructive Gemological Tool

The authors examined diamond grit-impregnated tweezers that reportedly were being marketed out of Japan.

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Faceting Large Gemstones

The techniques for cutting and polishing gemstone giants.

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The Separation of Natural from Synthetic Emeralds by Infrared Spectroscopy

The technique is nondestructive and, with Fourier transform instrumentation, extremely rapid in comparison to most laboratory methods.

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Gemstone Durability: Design to Display

A treatise on the design, display, care and repair of fine gemstones.

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