Editorial
Brazil’s Enigmatic Diamonds, Cuprian Liddicoatite, and Silicon in Corundum
Duncan Pay, Editor-in-Chief


An overview of the Spring 2017 Gems & Gemology content.

Read More

Articles (6)

Color
Color

The Role of Silicon in the Color of Gem Corundum

John L. Emmett, Jennifer Stone-Sundberg, Yunbin Guan, and Ziyin Sun, May 7, 2017

Considers the previously unreported but critical impact of silicon on the coloration of gem quality sapphire.

Read More
Color
Color

Japanese Jadeite: History, Characteristics, and Comparison with Other Sources

Ahmadjan Abduriyim, Kazuko Saruwatari, and Yusuke Katsurada, May 5, 2017

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

Read More
Chemical Composition
Chemical Composition

Cuprian Liddicoatite Tourmaline

Yusuke Katsurada and Ziyin Sun, May 8, 2017

Identifies 13 copper-bearing tourmalines, which have traditionally been assumed to be elbaite species, as liddicoatite.

Read More
Optical Effects
Optical Effects

Causes of Iridescence in
Natural Quartz

Xiayang Lin and Peter J. Heaney, May 8, 2017

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

Read More
Color
Color

Characteristics of Gem-Quality By-Product Synthetic Zincite

Ji Zhang, Yujie Gao, and Guanghai Shi, May 8, 2017

Investigates the properties of synthetic zincite produced by industrial kilns in Poland.

Read More
View All Articles In This Issue

Regular Features

Lab notes
Lab Notes

The latest advances and findings from GIA laboratories.

View All (10)
Gem News
Gem News International

Global coverage of gem sources, notable new gem materials, and recent industry developments.

View All (24)
Micro-World

An in-depth look at the hidden world of gem inclusions.

View All (6)
Book Review
Reviews

Your guide to the latest
gem and jewelry books
and other media.

View All (5)
Letters
Letters

G&G readers respond.

View All (1)

THE DR. EDWARD J. GÜBELIN
MOST VALUABLE ARTICLE AWARD

Jaipur, India: The Global Gem and Jewelry Power of the Pink City

Andrew Lucas, Nirupa Bhatt, Manoj Singhania, Kashish Sachdeva, Tao Hsu, and Pedro Padua

Inclusions in Natural, Synthetic, and Treated Emerald

Nathan D. Renfro, John I. Koivula, Jonathan Muyal, Shane F. McClure, Kevin Schumacher, and James E. Shigley

You Might Also Like

Find a Retailer
learn more
Shop the Campus Store
Learn More
Quality Assurance Benchmarks
Learn More
Gems & Gemology
G&G Spring 2017 Edition
Learn more