My grandmother left me a ring-dant set made by Palais Jewelers, which she bought in the early 1970''s in New York City. It is set in plat, with a 4k diamond surrounded by many small diamonds for a total of 12k. She had no paperwork on it at all, and I can''t get Palais Jewelers to answer their phone. Does anyone know anything about this jewelry store or a ring-dant set? I do know it is trade-marked. Thanks for any info you may have.