Raja Jai Singh was not one of Akbar's nine Navratnas (gems). The Navratnas included Raja Birbal, Raja Man Singh, Raja Todar Mal, Abdul Fazl, Faizi, Tansen, Raja Jai Singh I (of Amber, not the same person), and others. Jai Singh I of Amber was indeed a Navratna, but this question likely refers to a different Jai Singh or has confused the names.