Nadine Ifrah Leo and her daughter Maya Ella Nelson own the Mississippi River Pearl Jewelry, Co, est. 1982. Nadine traveled the American Rivers acquiring natural pearls, especially the upper Mississippi River. Nadine has supplied many of the finest jewelers around the world including Tiffany & Co, Harry Winston, Mikimoto, etc. She sold a 24mm Mississippi River Pearl to Queen Elizabeth's jeweler that was subsequently used in Princess Diana's Ring. Brooch has a large agate stone surrounded in 18K white gold and has a rare purple Mississippi River pearl set in a gorgeous cabochon along with a Citrine cabochon on the other end. Measures 3.5 inch long and 1.75 inch wide. Signed "Nadine" and "stamped "18K". This is an extraordinary and very rare piece.