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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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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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Sapphires from Antsiranana Province, Northern Madagascar
Sapphires from Antsiranana Province, Northern Madagascar | Gems & Gemology

Since 1996, large quantities of yellow to blue sapphires have been recovered from alluvial deposits derived from basaltic rocks in northern Madagascar.

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The Separation of Natural from Synthetic Colourless Sapphire

Greater amounts of colourless sapphire—promoted primarily as diamond substitutes, but also as natural gemstones—have been seen in the gem market during the past decade.

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Some Diagnostic Features of Russian Hydrothermal Synthetic Rubies and Sapphires

Most Russian hydrothermal synthetic rubies and pink, orange, green, blue and violet sapphires—coloured by chromium and/or nickel—reveal diagnostic zigzag or mosaic-like growth structures associated with colour zoning.

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Rubies and Fancy Sapphires from Vietnam
Rubies and Fancy Sapphires from Vietnam

Gem-quality rubies and pink to purple sapphires are being recovered from the Luc Yen and Quy Chau mining regions of Vietnam.

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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 Seven Types of Yellow Sapphire and Their Stability to Light

The authors determined that there are actually seven types of "yellow" sapphire on the market today, which differ in the cause of colour and the stability of the colour to light.

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Carbon Dioxide Fluid Inclusions as Proof of Natural-Coloured Corundum

An important clue in identifying natural-coloured corundum is the presence of carbon dioxide fluid inclusions.

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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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