4. Queen Elizabeth II
Prince Philip kept it in the family (HIS family) when he chose a ring to propose to the now Queen Elizabeth II in 1947.

Philip used a tiara gifted to him from is mother, Princess Alice of Battenberg, that was supposedly gifted to her by Tsar Nicholas II and Tsarina Alexandra, of the Russian Romanov family. The ring features a three-carat diamond surrounded by 10 smaller pavé diamonds. The fact that Philip was able to construct such a ring was very significant, because his family had lost most of their wealth. His mother truly sacrificed the last of her riches for him.