Well, given that Leslie Fields worked directly with the Royal Household and the Queen on her book, I think it would be strange if the facts turned out to be different. She states the Burmese Ruby Tiara used diamonds from the Nizam piece, which was broken up to create other pieces. This is not unusual when it comes to private gifts to members of the royal family.
Diana did the same thing with some of the gifts she received from the Gulf emirs, which were later reset in other designs and pieces more to her liking.
Diana did the same thing with some of the gifts she received from the Gulf emirs, which were later reset in other designs and pieces more to her liking.