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Home Research Nanofabrication

Cutting Diffraction Gratings to Improve Dispersion ("Fire") in Diamonds

Research Area: Nanofabrication Year: 2009
Type of Publication: Article Keywords: diffraction grating, etch, lithography, fire, dispersion, diamond, gem
Authors: A. Gilbertson; B. Gudlewski; M. Johnson; George Maltezos; Axel Scherer; J. Shigley
Journal: Gems and Gemology Volume: 45
Number: 4 Pages: 260-270
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. These Nanocut plasma-etched diamonds can be identified with magnification by the presence of small, unpolished-appearing areas on the facets where the grating pattern has been created. Round brilliant-cut diamonds displaying such patterns will be classified by the GIA Laboratory as modified round brilliants; as such, they will receive color and clarity grades, but not a cut grade.
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