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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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Study sample emeralds
A Preliminary Study on the Separation of Natural and Synthetic Emeralds Using Vibrational Spectroscopy

Reports preliminary findings—based on FTIR and Raman spectrometry of more than 300 samples—on distinguishing natural and synthetic emeralds using vibrational spectroscopy.

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A New Method for Detecting Be Diffusion-Treated Sapphires: Laser-Induced Breakdown Spectroscopy (LIBS)

This article describes the first application of laser-induced breakdown spectroscopy (LIBS) to gemmology.

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Tairus Hydrothermal Synthetic Sapphires Doped with Nickel and Chromium

Researchers from the Tairus joint venture have developed the technology for the hydrothermal growth of gem-quality crystals of synthetic sapphire.

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Update on Diffusion-Treated Corundum: Red and Other Colours

Blue diffusion-treated sapphires have become a subject of considerable controversy since their introduction in significant quantities a few years ago.

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Diagnostic Features and Heat Treatment of Kashmir Sapphires

Today, only by combining different gemmological tests with years of practical experience, can a conclusive determination of the origin of a sapphire be made.

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The Identification of Blue Diffusion-Treated Sapphires

Blue diffusion-treated sapphires are becoming more prevalent than ever before.

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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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The Elahera Gem Field in Central Sri Lanka

The Elahera gem field currently provides approximately 35% of the gemstones exported from Sri Lanka.

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The Sapphires of Mingxi, Fujian Province, China

Blue sapphires from China are similar to gem corundum from Australia, Thailand, and Kampuchea (Camodia).

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