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Sapphires from Australia

Terrence Coldham

September 1, 1985

An overview of Australia's recent significance in the production of blue sapphire.

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Bows in Jewelry: The Finishing Touch in Giving

Sharon Bohannon

February 4, 2019

Bows have been a popular motif and finishing touch in jewelry and fashion from time immemorial, recurring and adapting to reflect the style of the era.

Pinctada maculata pearls and mollusk shell

The Gemological Characteristics of Pipi Pearls Reportedly from Pinctada maculata

Nanthaporn Nilpetploy, Kwanreun Lawanwong, and Promlikit Kessrapong

February 1, 2019

Reveals the internal features and spectroscopic data of these small natural pearls and offers the means of separating them from pearls of related mollusk species.

General Gemology and Jewelry

December 4, 2018

Poster abstracts on “General Gemology and Jewelry” from GIA’s 2018 International Gemological Symposium.

New Technologies and Techniques

December 4, 2018

Poster abstracts on “New Technologies and Techniques” from GIA’s 2018 International Gemological Symposium.

Diamond Identification

December 4, 2018

Abstracts of speaker presentations from the “Diamond Identification” session of GIA’s 2018 International Gemological Symposium.

New Technologies and Techniques

December 4, 2018

Abstracts of speaker presentations from the “New Technologies and Techniques” session of GIA’s 2018 International Gemological Symposium.

An oval shaped bicolor tanzanite has purple on each side with blue-green in the middle.

Article

December Blues: Birthstone Gifts that Will Delight

Sharon Bohannon

December 7, 2018

Looking for a gift for someone special? December’s birthstones offer a treat for every taste, style and personality – even if it’s not their birth month.

Observations on HPHT-Grown Synthetic Diamonds: A Review

Sally Eaton-Magaña, James E. Shigley, and Christopher M. Breeding

November 8, 2017

Summarizes statistical data and distinctive features of several thousand gem-quality HPHT synthetic diamonds examined by GIA from 2007 through 2016.

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.

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