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Small unheated spinel and sapphire exhibited by Madagascar Imports
Unheated and Unusual Colors

Margit Thorndal of Madagascar Imports offers her perspective on the colored stone market.

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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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Beryllium Diffusion of Ruby and Sapphire

The heat treatment of corundum involving lattice diffusion of beryllium (Be) at temperatures over 1800°C has become a major issue in the gem trade.

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Fall 2016 Gems & Gemology Cover
Article
Fall 2016 G&G: CVD Synthetic Diamonds Survey, Reversible Color Change in Blue Zircon

A summary of the content found in the Fall 2016 issue of Gems & Gemology.

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Black star sapphire enhanced with lead glass
Lead Glass–Filled Black Star Sapphire

The first example of a lead glass–filled black star sapphire examined at GIA’s New York laboratory.

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Ruby and Sapphire Production and Distribution: A Quarter Century of Change
Ruby and Sapphire Production and Distribution: A Quarter Century of Change

During the past 25 years, the corundum market has been transformed from one of medium to high-priced gems to one that encompasses nearly all price ranges.

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Summer 2015 G&G: Dual-Stars, Photomicrography Guide, Rubies from Tajikistan, New Micro-World Section

G&G Brief presents an overview of the content of the Summer 2015 issue of Gems & Gemology.

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This specimen was revealed to be a synthetic star sapphire.
Synthetic Sapphire with Diffusion-Induced Color and Star

Diffusion treatment is used to induce color and asterism in a colorless synthetic sapphire.

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Orange sapphire submitted for identification
Beryllium-Diffused and Lead Glass–Filled Orange Sapphire

A sapphire receiving two distinct forms of treatment is seen at the Carlsbad laboratory.

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Spring 2015 G&G Examines Blue Spinel, Chinese Jewelry Design and the Latest in Synthetics

G&G Brief presents an overview of the content of the Spring 2015 issue of Gems & Gemology.

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