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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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The Identification of Blue Diffusion-Treated Sapphires

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

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Image of smartphone camera taking a photo of a gold brooch with gems
Article
How to Photograph Gems & Jewelry

Learn tips and tricks for taking great photos of gems and jewelry, even from your mobile device’s high-resolution camera.

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Article
Shenzhen: The Frontier of China’s Gem and Jewelry Industry

All jewelry professionals are familiar with the city of Shenzhen, a global jewelry manufacturing center and a leader of China’s fast-growing gem and jewelry industry. Join the GIA team as we tour the city and discover more about its leading jewelry brands.

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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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Insights From Inclusions

Natural gemstones are typically far more valuable than synthetic ones, so being able to identify them correctly is a powerful skill.

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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 gemology.

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Tairus Hydrothermal Synthetic Sapphires Doped with Nickel and Chromium

Researchers of 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 Colors

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 gemological tests with years of practical experience, can a conclusive determination of the origin of a sapphire be made.

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