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Diamond octahedron, diamond bort, and carbonado
Carbonado Diamond: A Review of Properties and Origin

Presents a detailed examination of about 800 samples of carbonado diamond from Brazil and the Central African Republic, including possible models for its genesis.

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Article
GIA Gem Project
Beryl

Chemically pure beryl is colorless, but trace elements give rise to green, blue and pink/red colors.

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Garnet
Article
GIA Gem Project
Garnet

Often thought of as a deep red gemstone, garnet can also be yellow, orange, green or brown – any color except blue.

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Article
Pyrope Garnet and Montana Sapphires Highlight Winter 2015 G&G

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

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Article
Fall 2015 G&G: Trapiche Emeralds, Synthetic Diamonds and a Large Diamond Source

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

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Optical Defects in Diamond: A Quick Reference Chart

A simple chart on optical defects in diamond, including those that produce coloration and fluorescence colors.

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Jadeite boulder from Itoigawa, Japan
Japanese Jadeite Tables

Examines the sources, color, texture, and chemical composition of jadeite from Japanese deposits.

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Iridescence in iris quartz from Jalgaon, India
Causes of Iridescence in Natural Quartz

Describes the occurrence of iridescence, and the role of differential etching, in quartz crystals from India’s Jalgaon District.

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Jadeite boulder from Itoigawa, Japan
Japanese Jadeite: History, Characteristics, and Comparison with Other Sources

Examines the sources, color, texture, and chemical composition of jadeite from Japanese deposits.

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Article
GIA Gem Project
Various Gems
(Amblygonite - Axinite)

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

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