A Pearl & Diamond Loop Tiara – similar to the pearl tiara in the bottom, which was worn by Princess Eulalia of Spain, on a Kokoshnik tiara frame.
The diamond riviere is a wedding gift of her mother Queen Isabella II of Spain.
some more of her jewel collection:
Infanta Eulalias splendid Necklace | Princess of Orleans Royal Jewels Spain
Infanta Eulalia Tiara | Royal Pearl and Diamond high Diadem Jewels