US Patent 8069688 - Nanostructured gemstones

http://www.freepatentsonline.com/8069688.html

This patent from the California Institute of Technology includes some broad claims for gemstones having improved brilliance based on the etching of non-periodic nanometer of micrometer features. Claim 1 reads:

1. A gemstone comprising a plurality of facets, wherein one or more of the facets have a hazy white-colored appearance, said appearance associated with non-periodic nanometer and/or micrometer sized features on said facets.