There is a book named 'Se as Jóias Falassem' (in english is something like 'If the jewelry speak') about the history of many portuguese royal jewels since the foundation of Portugal. Some of the jewels still belong to the Portuguese Royal Family, like the Queen Amelia Diamond Choker/Tiara. It contains lots of good pictures.
The author is now director of the National Palace of Ajuda and the prologue is from HRH D.Isabel, Duchess of Bragança.