Editorial
A Review of HPHT Synthetic Diamonds Grown for Jewelry Use
Duncan Pay, Editor-in-Chief


An overview of the Fall 2017 Gems & Gemology content.
 

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Articles (6)

Synthetics
Synthetics

Saltwater Pearls from the Pre- to Early Columbian Era: A Gemological and Radiocarbon Dating Study

Chunhui Zhou, Gregory Hodgins, Todd Lange, Kazuko Saruwatari, Nicholas Sturman, Lore Kiefert, and Klaus Schollenbruch, Nov 8, 2017

Examines 85 saltwater natural pearls, reportedly harvested from the Caribbean islands off the coast of Venezuela during the early 16th century, to determine their age.

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Chemical Composition
Chemical Composition

Photoluminescence Spectra of Emeralds from Colombia, Afghanistan, and Zambia

D. Brian Thompson, Christian J. Bayens, Matthew B. Morgan, Taylor J. Myrick, and Nealey E. Sims, Nov 8, 2017

Compares PL spectroscopy data of 48 emerald samples from three countries to evaluate the usefulness of the technique in geographic origin determination.

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Synthetics
Synthetics

Synthetic Star Sapphires and Rubies Produced by Wiede’s Carbidwerk, Freyung, Germany

Karl Schmetzer, H. Albert Gilg, and Heinz-Jürgen Bernhardt, Nov 8, 2017

Details the process used by Wiede’s Carbidwerk to produce star synthetic corundum from the mid-1950s through the 1970s.

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Chemical Composition
Chemical Composition

True Colors of Dalmatian “Jasper”

Tomasz Powolny and Magdalena Dumańska-Słowik, Nov 8, 2017

Discusses the mineralogical composition and provenance of this spotted decorative gemstone.

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Mining
Mining

Colombian Emerald Industry: Winds of Change

Darwin Fortaleché, Andrew Lucas, Jonathan Muyal, Tao Hsu, and Pedro Padua, Nov 8, 2017

A firsthand look at Colombia’s emerald mines and the cutting and trading industry in Bogotá.

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Regular Features

Lab notes
Lab Notes

The latest advances and findings from GIA laboratories.

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Micro-World

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

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Gem News
Gem News International

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

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Book Review
Reviews

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

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Letters
Letters

G&G readers respond.

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2017
G&G CHALLENGE WINNERS

Congratulations to the readers who earned a perfect score on this year's Challenge quiz.

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