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A large group of people outside on GIA’s Carlsbad, California campus.

Article

Guardians of Trust: GIA’s Innovative Research, Instruments and Services

Russell Shor, September 20, 2019

GIA’s services and instruments have grown in importance and impact as new gem treatments and laboratory-grown gems have entered the market.

Emerald crystals from Colombia, Afghanistan, and Zambia

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, November 8, 2017

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

Colombian Emerald Mining: Will the Giant Awaken?

Guy Lalous , October 31, 2014

Overview and commentary on the 2013 The Journal of Gemmology article “Peñas Blancas: An Historic Colombian Emerald Mine".

Unusual Curved Colour Zoning In Emerald

Nathan Renfro, Vincent Pardieu, and Supharart Sangsawong, GIA, July 1, 2013

A report on a 1.17 ct emerald obtained in Kabul, Afghanistan for GIA's permanent reference collection

Figure 9. The parcel of rough spinel on the left, reportedly from Tajikistan, contains pieces weighing up to 48.5 g. The seven faceted spinels on the right (9.04–28.16 ct) were fashioned from some of this rough.

Purplish Pink Spinel from Tajikistan: Before and After Cutting

Nicholas Sturman, March 1, 2009

Purplish Pink Spinel from Tajikistan: Before and After Cutting

On the Identification of Various Emerald Filling Substances

Mary L. Johnson, Shane Elen, June 1, 1999

Criteria for distinguishing emerald filling substances were investigated.

Emeralds from the Mananjary Region, Madagascar: Internal Features

Dietmar Schwarz, June 1, 1994

Mananjary emeralds usually can be separated from emeralds from other localities by means of associations of certain mineral inclusions.

Emeralds from the Ural Mountains, USSR

Karl Schmetzer, Heinz-Jürgen Bernhardt, June 1, 1991

Emeralds are again being mined in the historic district of the Ural Mountains. Physical, chemical, spectroscopic and microscopic characteristics of stones from the recent production are presented and compared with data on older samples as well as those reported in the literature.

Fracture Filling of Emeralds Opticon and Traditional "Oils"

Robert C. Kammerling, John I. Koivula, June 1, 1991

The filling of surface-reaching breaks in emeralds is a relatively common practice, for which various kinds of oils and a natural resin have historically been used.

Emeralds of the Panjshir Valley, Afghanistan

Gary Bowersox, Lawrence W. Snee, March 1, 1991

With the withdrawal of Soviet troops from Afghanistan, villagers in the Panjshir Valley are turning their attention to the emerald riches of the nearby Hindu Kush Mountains.

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