Patent ID: 8479538

Claim:
A gemstone comprising: a body comprising diamond, said body having a crown portion and a pavilion portion; and a first diffractive optical element disposed on or in said pavilion portion of said body, said first diffractive optical element comprising a plurality of diffractive features spaced with respect to each other to diffract visible light, wherein said first diffractive optical element is disposed on or in a first facet of said pavilion portion of said body along the optical path of a ray of visible light which enters the crown portion of said body, and further comprising: a second diffractive optical element disposed on or in a second facet of said pavilion portion of said body along said optical path of said ray of visible light through said body, wherein said first diffractive optical element separates said ray of visible light into a plurality of angularly separated diffractive orders, and wherein said second diffractive optical element does not substantially reduce the angular separation between said plurality of angularly separated diffractive orders.