Pastel Pyropes
An Update on Color in Gems. Part 3: Colors Caused by Band Gaps and Physical Phenomena
The final part of this series is concerned with colors explained by band theory, such as canary yellow diamonds, or by physical optics, such as play-of-color in opal.
Faceting Large Gemstones
Chrysoberyl and Alexandrite from the Pegmatite Districts of Minas Gerais, Brazil
Mining fine cat's-eye chrysoberyl and alexandrite in Brazil.
An Update on Color in Gems. Part 2: Colors Involving Multiple Atoms and Color Centers
This is the second part in a three-part series on the origin of color in gem materials.
The Gemological Properties of the De Beers Gem-Quality Synthetic Diamonds
The History and Gemology of Queen Conch "Pearls"
This article reviews the history of the conch "pearl," discusses S. gigas and its fisheries, and examines the gemological properties and other characteristics of this attractive material.
The Seven Types of Yellow Sapphire and Their Stability to Light
An Update on Color in Gems. Part 1: Introduction and Colors Caused by Dispersed Metal Ions
This three-part series of articles reviews our current understanding of gemstone coloration.
The Occurrence and Gemological Properties of Wessels Mine Sugilite
Gemstone Durability: Design to Display
"Modern" Jewelry: Retro to Abstract
A New Gem Material from Greenland: Iridescent Orthoamphibole
Art Nouveau: Jewels and Jewelers
This article discusses the origins of Art Nouveau and outlines the distinctive interpretations and contributions made by significant Art Nouveau jewelers.
The Gemological Properties of the Sumitomo Gem-Quality Synthetic Yellow Diamonds
Contemporary Intarsia: The Medvedev Approach to Gem Inlay
The techniques of this precision inlay style are explained.
Fall 1986 G&G Lab Notes
Carbon Dioxide Fluid Inclusions as Proof of Natural-Colored Corundum
An important clue in identifying natural-colored corundum is the presence of carbon dioxide fluid inclusions.
A Simple Procedure to Separate Natural from Synthetic Amethyst on the Basis of Twinning
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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