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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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Assortment of Linde synthetic star rubies and sapphires
Dual-Color Double Stars in Ruby, Sapphire, and Quartz: Cause and Historical Account

Examines a form of asterism comprising two six-rayed stars, one white and one that exhibits the stone’s bodycolor. Firsthand accounts and a survey of patent documents reveal that diffusion has been used to create or enhance this optical phenomenon in synthetic and possibly natural corundum since the 1950s.

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Article
Living ‘Miracle to Miracle’: Gemologist Reflects on 30 Years in the Colombian Emerald Trade

Graduate’s fascination with gems began in GIA’s warehouse and put him on a fast track to becoming an expert on Colombian emeralds.

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Large Fluorite Sphere
Fluorite Sphere with Phosphorescent Coating

A sphere with unusual phosphorescence is seen in the Carlsbad laboratory.

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Gemstone Enhancement and its Detection in the 1980s

The impact that enhancements had on the gem market in the 1980s may be unparalleled in the history of the industry.

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Article
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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Orangy Pink Coated "Soft Coral"

A coral specimen that was coated—not dyed—with a coloring agent only on the surface, an unusual method evidenced by microscopic features.

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The “Glet Filling”: The Filling of the Cracks in Precious Stones Under Scrutiny

This short article discusses several important aspects of crack-filling in colored stones and diamonds.

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Chart of Commercially Available Gem Treatments

This chart combines a comprehensive listing of the commercially available treatments for the most commonly used gem materials with an indication of the current status of their detectability.

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Gemstone Enhancements and Detection in the 1990s

Gemstone enhancements and their disclosure became the most important gemological issue for the jewelry trade in the 1990s.

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