Article Search Results

A face-up view of a cushion cut diamond with blue color.

Article

Gems & Gemology’s 7 Most Unusual Encounters from 2019

Stuart Overlin, Brooke Goedert and Kellie Giordano, December 13, 2019

Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.

G&G Brief presents an overview of the content of the Fall 2015 issue of Gems & Gemology.

Article

Autumn 2015 G&G: Trapiche Emeralds, Synthetic Diamonds and a Large Diamond Source

Russell Shor, November 4, 2015

G&G Brief presents an overview of the content of the Autumn 2015 issue of Gems & Gemology.

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.

Article

Summer 2015 G&G: Dual-Stars, Photomicrography Guide, Rubies from Tajikistan, New Micro-World Section

Russell Shor, August 14, 2015

G&G Brief presents an overview of the content of the Summer 2015 issue of Gems & Gemology.

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.

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.

Gemesis Laboratory-Created Diamonds

James E. Shigley, Reza Abbaschian, December 1, 2002

High-quality synthetic diamonds created by the Gemesis Corp. are examined and their gemmological properties are explicated.

De Beers near Colourless-to-Blue Experimental Gem-Quality Synthetic Diamonds

Marie-Line T. Rooney, C. M. Welbourn, March 1, 1993

De Beers has produced a faceted synthetic gem-quality diamond that could go unrecognised without careful gemmological testing.

1.50 ct Fancy Dark grey CVD synthetic diamond

Two Fancy Dark Grey CVD Synthetic Diamonds

Troy Ardon and Sally Eaton-Magaña, October 31, 2014

Examination of two CVD synthetic diamonds with an unusual Fancy Dark grey colour.

The Gemmological Properties of the Sumitomo Gem-Quality Synthetic Yellow Diamonds

James E. Shigley, Emmanuel Fritsch, December 1, 1986

Sumitomo Electric Industries is producing gem-quality synthetic yellow diamonds in deep yellow single crystals in sizes up to 2 ct.

Article Search Results

Types

Content Type

Reviewed

Topics

Topics

Gemstones

Gemstones

Article Search Results

Types

Content Type

Reviewed

Topics

Topics

Gemstones

Gemstones

Find a Retailer

Visit the campus shop

Subscribe to Knowledge Rocks Emails

G&G Spring 2021 Edition