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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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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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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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Faceting Large Gemstones

The techniques for cutting and polishing gemstone giants.

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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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Two Notable Colour-Change Garnets

The gemmological properties and chemical compositions of two unusual colour-change garnets are reviewed.

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Portable Instruments and Tips on Practical Gemmology in the Field

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

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A History of Diamond Treatments

Modern gemmologists and diamantaires are faced with a broad spectrum of colour and clarity treatments ranging from the simple to the highly sophisticated.

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An Introduction to Spectroscopy in Gem Testing

When Isaac Newton first held a prism up to the sun, he scarcely could have imagined the influence of the spectroscope on modern gem testing.

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A Solution to Diamond Colour Grading Problems

Although GIA’s system for evaluating diamond quality has been an industry benchmark since 1955, it all began with the efforts of Robert Shipley Sr. and Richard T. Liddicoat a decade earlier.

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