CVD Synthetic Diamonds from Gemesis Corp
An examination of the gemmological and spectroscopic properties of CVD synthetic diamonds from Gemesis Corp.
The “Type” Classification System of Diamonds and Its Importance in Gemmology
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.
Abstracts; Summer 2009
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.
GE POL Diamonds: Before and After
This article explores and identifies the changes that type IIa GE POL diamonds experience before and after HPHT annealing.
New Filling Material for Diamonds from Oved Diamond Company: A Preliminary Study
The Oved Diamond Company’s new glass formulation is tested with mixed results.
A Visual Guide to the Identification of Filled Diamonds
This article illustrates the various features in filled diamonds and explores the best techniques for examining them.
A History of Diamond Treatments
Modern gemmologists and diamantaires are faced with a broad spectrum of colour and clarity treatments ranging from the simple to the highly sophisticated.
An Updated Chart on the Characteristics of HPHT-Grown Synthetic Diamonds
A new chart, supplementing the one published in the Winter 1995 issue of Gems & Gemmology, summarises the features of both as-grown (“non-modified”) and treated (“modified”) synthetic diamonds currently in the gem market.
A New Lasering Technique for Diamond
Several diamonds were treated for the purposes of observation and report with a new laser technique which does not show the typical surface-reaching drill hole.
“Fluorescence Cage”: Visual Identification of HPHT-Treated Type I Diamonds
HPHT-treated type I diamonds of various colours may exhibit unusually intense fluorescence at the facet edges and junctions.