Princess Faiza of Egypt's art deco emerald and diamond necklace was sold at Christie's in 2013 for $4,203,848. It was made by Van Cleef & Arpels in 1929 and modified in 1937 but was not bought by Princess Faiza until 1947.
Princess Faiza also owned the beautiful Pivoine Clips by Van Cleef & Arpels. They were made in 1937 but not bought until 1946. She sold the clips separately before passed away in 1994 and one of them was re-bought by Van Cleef & Arpels.