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Figure 1. From left: Jacob Lowry, Sean Hyrons, Matthew Wernz, and Kenneth Van Wey engage in a panel discussion titled “Laws: Liabilities and Protections.” Photo courtesy of the Turquoise Museum.

Turquoise United Conference 2023

Alex Goodsuhm and Aaron Palke, November 3, 2023

A recap of the second annual Turquoise United Conference.

Very Large CVD-Grown Synthetic Diamond

Wuyi Wang, Kyaw Soe Moe, Siau Fung Yeung, and Ulrika D’Haenens-Johansson, March 29, 2013

The New York laboratory recently tested a 2.16 ct CVD synthetic from Scio Diamond Technology Corp., the largest specimen GIA has seen so far.

A 1.71 ct synthetic moissanite features a fraudulent GIA inscription.

Fraudulently Inscribed Synthetic Moissanite

Shoko Odake, November 11, 2022

The Mumbai laboratory finds a fraudulent GIA inscription on synthetic moissanite.

Turquoise Museum in Albuquerque, New Mexico.

Inaugural Turquoise United Conference

Tao Hsu and Aaron Palke, November 11, 2022

A report on the first-ever Turquoise United conference in Albuquerque, New Mexico.

Pearl Classification: The GIA 7 Pearl Value Factors

Joyce Wing Yan Ho and Sally Chan Shih, September 3, 2021

Provides a visual guide to GIA’s approach to classifying and describing pearls.

Natural-Color D-to-Z Diamonds: A Crystal-Clear Perspective

Sally Eaton-Magaña, Troy Ardon, Christopher M. Breeding, and James E. Shigley, January 22, 2021

Examines a very large dataset of colorless to near-colorless diamonds submitted to GIA and evaluates their diamond type and spectroscopic properties.

Synthetic moissanite with a fraudulent inscription.

Synthetic Moissanite with Fraudulent GIA Inscription

Sicebiso Hlatshwayo and Sally Eaton-Magaña, January 22, 2021

GIA Johannesburg identifies fraudulent GIA inscriptions on several synthetic moissanites submitted as diamonds.

Infrared Spectroscopy in Gem Identification

Emmanuel Fritsch and Carol M. Stockton, March 1, 1987

The authors describe the new Nicolet 60SX Fourier transform infrared spectrometer recently acquired by GIA's Research Department.

Naturally Colored Yellow and Orange Gem Diamonds: The Nitrogen Factor

Christopher M. Breeding, Sally Eaton-Magaña, and James E. Shigley, October 22, 2020

Presents the four major groups of defects responsible for the color in nearly all yellow and orange diamonds.

Developments in Gemstone Analysis Techniques and Instrumentation During the 2000s

Christopher M. Breeding, Andy H. Shen, Sally Eaton-Magaña, George R. Rossman, James E. Shigley, and Al Gilbertson, October 4, 2010

The first decade of the 2000s continued the trend of using more powerful analytical instruments to solve gem identification problems.

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