Article Search Results

Fancy Dark brown to Fancy black Marange diamonds

Black Diamonds from Marange (Zimbabwe): A Result of Natural Irradiation and Graphite Inclusions

Karen V. Smit, Elina Myagkaya, Stephanie Persaud, and Wuyi Wang, August 6, 2018

Characterises a suite of 40 natural brown to black diamonds from this deposit so that they can be distinguished from suspected treated black diamonds.

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

Natural-Colour Blue, Grey and Violet Diamonds: Allure of the Deep

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

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

Cutting Diffraction Gratings to Improve Dispersion (“Fire”) in Diamonds

Al Gilbertson, Benjamin Gudlewski, Mary Johnson, George Maltezos, Axel Scherer, and James Shigley

A new microlithography process developed to create high-resolution diffraction grating patterns on portions of certain facets can improve the dispersion of light and thus the amount of “fire” in a diamond.

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.

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.

Abstract Header from the 2009 issue of Gems & Gemology

Abstracts; Summer 2009

Brendan M. Laurs, Thomas W. Overton

This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.

10 Study Samples Before and After HPHT Processing

GE POL Diamonds: Before and After

Christopher P. Smith, George Bosshart, September 1, 2000

This article explores and identifies the changes that type IIa GE POL diamonds experience before and after HPHT annealing.

De Beers Natural versus Synthetic Diamond Verification Instruments

Christopher M. Welbourn, Martin Cooper, September 1, 1996

Two instruments have been developed at De Beers DTC Research Centre, Maidenhead, to distinguish synthetic diamonds from natural diamonds.

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.

Marine mining of diamonds off the west coast of Southern Africa

John J. Gurney, Alfred A. Levinson, December 1, 1991

It is anticipated that production of diamonds from the sea will increase substantially in the future.

Article Search Results

Types

Content Type

Reviewed

Topics

Topics

Gemstones

Article Search Results

Types

Content Type

Reviewed

Topics

Topics

Gemstones

Find a Retailer

Visit the campus shop

Subscribe to Knowledge Rocks Emails

G&G Spring 2021 Edition