Research Article Search Results

Recently discovered and legendary diamonds in the blue/gray/violet color range

Natural-Color Blue, Gray, and Violet Diamonds: Allure of the Deep

Sally Eaton-Magaña, Christopher M. Breeding, and James E. Shigley, August 6, 2018

Summarizes data collected on more than 15,000 natural blue/gray/violet diamonds examined by GIA during the last decade and examines the mechanisms that produce this color range.

Experimental steps of DNA extraction and purification.

DNA Techniques Applied to the Identification of Pinctada Fucata Pearls from Uwajima, Ehime Prefecture, Japan

Kazuko Saruwatari, Michio Suzuki, Chunhui Zhou, Promlikit Kessrapong, and Nicholas Sturman, May 11, 2018

Shows how genetic material extracted from small amounts of pearl powder can be a useful indicator of this akoya cultured pearl species.

Fluorescence image of Aurora Butterfly of Peace

An Introduction to Photoluminescence Spectroscopy for Diamond and Its Applications in Gemology

Sally Eaton-Magaña and Christopher M. Breeding, April 28, 2016

Presents the underlying physics and methodology of this analytical technique, which has become an essential tool in identifying treated and synthetic diamonds.

Natural-Color Pink, Purple, Red, and Brown Diamonds: Band of Many Colors

Sally Eaton-Magaña, Troy Ardon, Karen V. Smit, Christopher M. Breeding, and James E. Shigley, February 1, 2019

Summarizes data collected by GIA on more than 90,000 natural diamonds in this color range and presents their gemological and spectroscopic properties.

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.

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.

Identification of “Pistachio” Colored Pearls Treated by Ballerina Pearl Co.

Chunhui Zhou, Joyce Wing Yan Ho, Sally Chan, Jessie Yixin Zhou, Surjit Dillon Wong, and Kyaw Soe Moe, April 28, 2016

A report on the color treatment process for these intensely greenish yellow to yellowish green cultured pearls and the techniques for identifying them.

Pearl farm on the Indonesian island of Lombok

Bead-Cultured and Non-Bead-Cultured Pearls from Lombok, Indonesia

Nicholas Sturman, Jeffery Bergman, Julie Poli, Artitaya Homkrajae, Areeya Manustrong, and Nanthaporn Somsa-ard, November 7, 2016

Documents the retrieval and testing of P. maxima cultured pearls from a Lombok hatchery.

A group of rings featuring alexandrite from Brazil

Geographic Origin Determination of Alexandrite

Ziyin Sun, Aaron C. Palke, Jonathan Muyal, Dino DeGhionno, and Shane F. McClure, January 31, 2020

The geographic source of this rare color-change gem has a significant impact on value. Trace element chemistry profiles allow GIA to accurately determine origin for alexandrite from several countries.

Geographic Origin Determination of Emerald

Sudarat Saeseaw, Nathan D. Renfro, Aaron C. Palke, Ziyin Sun, and Shane F. McClure, January 31, 2020

The relative chemical diversity of emeralds from different deposits worldwide allows clear origin determination in most cases. This contribution explains the criteria used by GIA to make geographic origin conclusions for emeralds.

Research Article Search Results

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Gemstones

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Research Article Search Results

Types

Topics

Topics

Gemstones

Gemstones

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