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Nanocut Plasmaetched Diamonds
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.

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Abstract Header from the 2009 issue of Gems & Gemology
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.

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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.

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Diamonds in Their Initial States, After UV Exposure and After Heating
Colour Alterations in CVD Synthetic Diamond with Heat and UV Exposure: Implications for Colour Grading and Identification

In response to heat and UV exposure, some synthetic diamond gemstones grown by chemical vapor deposition exhibit large, reversible changes in colour.

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0.76 ct HPHT-treated Diamond
“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.

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Modelling the Appearance of the Round Brilliant Cut Diamond: An Analysis of Fire, and More about Brilliance

This second major article in a three-dimensional modelling study analyses fire – the visible extent of light dispersed into spectral colours.

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Ruby in Diamond

The first substantiated identification of corundum (var. ruby) occurring as an inclusion in natural diamond is presented.

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Modelling the Appearance of the Round Brilliant Cut Diamond: An Analysis of Brilliance

A mathematical model which can analyse how appearance factors depend on proportions.

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A Report on the New Watermeyer Split-Facet Diamond Cuts

Introducing a new technique in diamond cutting that virtually eliminates the "bow-tie" effect.

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The Characteristics and Identification of Filled Diamonds

This article reports on the study of six diamonds, both before and after a filling treatment, and the examination of 12 additional filled stones.

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