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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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UV/Vis/NIR Absorption Spectrum
Spectroscopic Evidence of GE POL HPHT-Treated Natural Type IIA Diamonds

Results from spectroscopic analyses of GE POL high-pressure high-temperature (HPHT) annealed nominally type IIa diamonds are presented, and these spectral characteristics are compared with those of untreated diamonds of similar appearance and type.

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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 colors may exhibit unusually intense fluorescence at the facet edges and junctions.

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Clues to the Process Used by General Electric to Enhance the GE POL Diamonds

General Electric has developed a variety of high-temperature annealing techniques at different pressures for enhancing the optical properties of polycrystalline synthetic diamond films and single-crystal synthetic diamond.

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Synthetic Moissanite: A New Diamond Substitute

Synthetic moissanite is much closer to diamond in overall appearance and heft than any previous diamond imitation; this article reports on how to identify and characterize it.

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Natural Diamond
A Chart for the Separation of Natural and Synthetic Diamonds

Exploration of a chart designed to give jewelers and gemologists a practical guide to identifying synthetic diamonds as they enter the jewelry trade.

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An Update on Filled Diamonds: Identification and Durability

This report focuses on recent products from Yehuda/Diascience, Koss & Schecter Diamonds (Genesis II), and Clarity Enhanced Diamond House (a subsidiary of Goldman Oved Diamond Co.).

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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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10 Study Samples Before and After HPHT Processing
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.

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A New Lasering Technique for Diamond
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.

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