RAPAPORT... The U.S. Patent & Trademark Office (USPTO) issued a patent for a "Modified Princess Cut Diamond Having Hearts and Arrows Pattern and Method" to Worldwide Diamond Trademarks Ltd. of Canada. The patent, number 7,992,410, was issued on August 9 and invented by Roni Rydlewicz of Brussels.
According to the USPTO abstract, the patent involves "a modified princess cut diamond and method of forming a modified princess cut diamond into a symmetrical shape possessing a hearts and arrows pattern characteristic of the true hearts and arrows pattern in a round cut diamond.'' The entry is very detailed and carries a number of claims along with a description and images, all of which can be viewed here.