Article Search Results

Inclusions in Natural, Synthetic and Treated Ruby

Nathan D. Renfro, John I. Koivula, Jonathan Muyal, Shane F. McClure, Kevin Schumacher, and James E. Shigley, January 26, 2018

Provides a visual guide to the internal features of natural, synthetic and treated rubies.

A blue synthetic star sapphire from past production of Wiede’s Carbidwerk

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

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

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

Drilled natural pearls examined in this study.

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

Chunhui Zhou, Gregory Hodgins, Todd Lange, Kazuko Saruwatari, Nicholas Sturman, Lore Kiefert, and Klaus Schollenbruch, November 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.

Eight HPHT faceted synthetic diamonds from AOTC Group

Near-Colourless HPHT Synthetic Diamonds from AOTC Group

Ulrika F.S. D’Haenens-Johansson, Kyaw Soe Moe, Paul Johnson, Shun Yan Wong, Ren Lu, and Wuyi Wang, April 30, 2014

Presents the gemmological and spectroscopic properties of a suite of synthetic diamonds grown by AOTC using high pressure and high temperature.

The 3543 CM-1 Infrared Absorption Band in Natural and Synthetic Amethyst and its Value in Identification

Vladimir S. Balitsky, Denis V. Balitsky, June 1, 2004

The proper use and limitations of IR spectroscopy for identifying natural versus synthetic amethyst of various types have been investigated, focusing on the region 3800–3000 cm-1.

Grey-To-Blue-To-Violet Hydrogen-Rich Diamonds from the Argyle Mine, Australia

Carolyn H. van der Bogert, Christopher P. Smith, Thomas Hainschwang, and Shane F. McClure

The Argyle diamond mine is the only known source of type IaB hydrogen- and nitrogen-rich diamonds coloured grey to blue to violet.

Strongly Coloured Pink CVD Lab-Grown Diamonds

Wuyi Wang, March 1, 2010

Pink CVD lab-grown products can be separated from natural and treated-colour natural pink diamonds by a combination of gemmological and spectroscopic properties, which are explored in this study.

CVD Synthetic Diamonds from Gemesis Corp

Wuyi Wang, Ulrika F. S. D’Haenens-Johansson, Paul Johnson, Kyaw Soe Moe, Erica Emerson, Mark E. Newton, and Thomas M. Moses, June 1, 2012

An examination of the gemmological and spectroscopic properties of CVD synthetic diamonds from Gemesis Corp.

Celebrating 75 Years of Gems & Gemology

Stuart Overlin and Dona M. Dirlam

Gems & Gemology, the professional quarterly of GIA, debuted in 1934

Coloured Diamonds in the Aurora Butterfly of Peace Collection

The “Type” Classification System of Diamonds and Its Importance in Gemmology

Christopher M. Breeding and James E. Shigley, June 1, 2009

Knowledge of type allows gemmologists to better evaluate if a diamond might be treated or synthetic, and whether it should be sent to a laboratory for testing.

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Article Search Results

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