Fluorescence produced by optical defects in diamond: measurement, characterisation and challenges
How variations in UV lamp output can affect observed fluorescence colour and intensity.
Cutting Diffraction Gratings to Improve Dispersion (“Fire”) in Diamonds
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.
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.
De Beers near Colourless-to-Blue Experimental Gem-Quality Synthetic Diamonds
De Beers has produced a faceted synthetic gem-quality diamond that could go unrecognised without careful gemmological testing.
Gemstone Durability: Design to Display
A treatise on the design, display, care and repair of fine gemstones.
Marine mining of diamonds off the west coast of Southern Africa
It is anticipated that production of diamonds from the sea will increase substantially in the future.
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.