ALEXANDRIA, Va., March 26 -- United States Patent no. 12,259,333, issued on March 25, was assigned to The RealReal Inc. (San Francisco).

"Comparing gemstone signatures using angular spectrum information" was invented by Loretta Catherine Castoro (Burlingame, Calif.), Meghan Elizabeth Ryterski (Tucson, Ariz.), Matthew Bryan Heger (Tucson, Ariz.), Ludovico Borghi (Tucson, Ariz.), Emily Elizabeth Calara English (Tucson, Ariz.), Chengyu Zhu (Tucson, Ariz.) and Jose Sasian (Tucson, Ariz.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A system comprises a faceted structure imaging assembly and a faceted structure image analyzer. Signature information of the gemstone is obtained and compared to stored signature inf...