The EGL USA Group's Research

PRESS RELEASES

EGL USA GROUP ANNOUNCES NEW UNIQUE FEATURES FOR LABORATORY-GROWN DIAMOND GRADING REPORTS
The EGL USA group has been leading the industry in the grading and reporting on synthetic diamonds. It made ground-breaking contributions when it first started certifying lab-created diamonds in 2001 and now is announcing new features of its lab-created diamond reports.
Read more and view the new EGL USA Laboratory-created Diamond Report here

EGL USA GROUP IDENTIFIES NEW GENERATION OF SURFACE TREATED DIAMONDS
Over recent months, a number of pink and orange diamonds were submitted to the EGL USA laboratories in New York and Vancouver, disclosed as "infused" or "HPHT treated" in the US and Asia. When tested, however, the treatment characteristics were found to be inconsistent with the disclosure.
Read the PRESS RELEASE here ...
Read the TECHNICAL REPORT here ....

THE PROBLEM OF IDENTIFYING JEWELRY SET WITH 0.02CT SYNTHETIC DIAMONDS - EGL USA HAS THE ANSWER
With the increasing influx of undisclosed gem quality synthetic diamonds on the market, many customers remain unaware of the risks of paying for a natural diamond, which in fact is a synthetic diamond. This is particularly true of small (0.01 to 0.05cts) yellow diamonds, the predominant colour and popular size of synthetic diamond.
Read more ...

HPHT PROCESS ON DIAMONDS - FOUNDATION AND APPLICATION
When compared to other industries, the jewelry industry uses insignificant quantities of lab created diamonds. This number, however, is constantly increasing as both the press-type and the HPHT process is being applied as a color enhancement process of natural diamonds.
Read more .....


RESEARCH POSTERS -
click on the title to view the complete poster

Identification of CVD gem-quality, single-crystal diamond, as-grown and HPHT-treated

Use of cathodoluminescsence techniques in separation of gem-quality type II natural, HPHT treated and lab-created diamonds (HPHT and CVD)
Study of Fancy-Color and Near-Colorless HPHT-Grown Synthetic Diamonds from Advanced Optical Technology Co., Canada

Cross-Referencing Indentification System (CIS) - Database and Tool for Diamond Research

Novel Characteristic Optical Features of Natural Diamonds with Pink Coloration

Identification of Near-colourless and Colourless HPHT-grown and CVD-grown Diamonds, Loose and Mounted in Jewellery


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Education Programs
Introduction to Diamond Grading
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How to Sell Diamonds with EGL Certificates
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Buying Better Quality Diamonds
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Member of Canadian Jewellers Association
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Informative Articles
Informative Articles
To keep you abreast of new discoveries in gemstone research, synthetics and treatments, we have listed a selection of informative articles written by experts in their field. Check this page regularly for updates.
"European Gemological Laboratory Defines SI3"
Adding the SI3 clarity grade to the grading system was the next logical step.
'The Scoop on synthetics'
Can we ID them? Should we grade them? Do we need them?
'Cultured Confusion'
Should a man-made diamond be called "synthetic", or "cultured" and who are the important players in this controversial addition to the diamond industry?
"A Gemological Study of A Collection of Chameleon Diamonds"
The rarity of chameleon diamonds and their interest for the connoisseur are due to their unusual ability to change color temporarily when heated to about 150C, or after prolonged storage in the dark.
"Interpreting Diamond Morphology" - Part I
A diamond's morphological features reflect conditions of diamond formation and represent a unique characteristic than can be used to identify details of the sources of diamonds.
"Interpreting Diamond Morphology" - Part II
Morphological features reflect conditions both during diamond formation and also after emplacement, especially where alluvials are concerned.