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Figure 1. One of GIA’s new LA-ICP-MS corundum calibration standards sets (set number 1); the epoxy disk containing the set is 1.5 inches in diameter. NIST SRM 610 and 612 glass standards are included to account for trace and non-trace elements, such as those found in inclusions, that were not incorporated into the synthetic sapphire crystals grown for standards. Photo by Jennifer Stone-Sundberg.
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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Optimising Face-Up Appearance in Coloured Gemstone Faceting

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

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

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

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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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Global Rough Diamond Production Since 1870

Historically, global rough diamond production has fluctuated greatly due to a myriad of causes, many of which are explored in this article.

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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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Fingerprinting of Two Diamonds Cut from the Same Rough

With the information from a combination of tools now available, the sophisticated gemmologist can fingerprint a given stone.

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Modelling the Appearance of the Round Brilliant Cut Diamond: An Analysis of Brilliance

A mathematical model which can analyse how appearance factors depend on proportions.

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The Rise to Prominence of the Modern Diamond Cutting Industry in India

this article reviews the rise of the modern diamond cutting industry in India and its impact on the world diamond trade

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