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The increasing popularity of cultured pearls with unusual color and size combinations
Cultured Pearl Update

Duncan Pay and Jennifer-Lynn Archuleta, May 11, 2018

Fran Mastoloni shares his thoughts on the status of the cultured pearl market.

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Tahitian, South Sea, and akoya pearls
Pearl Classification: The GIA 7 Pearl Value Factors

Joyce Wing Yan Ho and Sally Chan Shih, September 3, 2021

Provides a visual guide to GIA’s approach to classifying and describing pearls.

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Montana sapphires after two rounds of heating
Big Sky Country Sapphire: Visiting Montana’s Alluvial Deposits

Tao Hsu, Andrew Lucas, Robert E. Kane, Shane McClure, and Nathan Renfro, August 7, 2017

Documents a visit to the upper Missouri River and Rock Creek sapphire mining areas.

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Gerd Dreher agate lily and Patrick Dreher citrine mouse
Gem Virtuosos: The Drehers and Their Extraordinary Carvings

Robert Weldon, Cathleen Jonathan, and Rose Tozer, January 26, 2018

A look at the artistic heritage of the Drehers, an influential family of gem carvers in Idar-Oberstein, Germany.

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Opal, Quality, Factors
Article
Opal Quality Factors

Individual opals are as diverse as snowflakes or fingerprints and can vary widely in appearance and quality. Learn about the factors that make opals so desirable!

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Alexandrite
Article
Alexandrite Quality Factors

Learn about the factors that make alexandrite so desirable.

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Zircon
Article
Zircon Quality Factors

Learn about the factors that make zircon so desirable.

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Tanzanite
Article
Tanzanite Quality Factors

Learn about the factors that make tanzanite so desirable.

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Vivid Red Spinel
Article
Spinel Quality Factors

Learn about the factors that make spinel so desirable.

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Moonstone
Article
Moonstone Quality Factors

Learn about the factors that make moonstone so desirable.

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