There seems to exist yet another tiara never worn so far by Queen Letizia, konwn as the Carrera y Carrera tiara.
Apparently this tiara was a 2004 wedding gift to the then Pss of Asturias by jewelers Carrera y Carrera. The Carrera y Carrera firm has since then enter in bankrupcy.
A very similar tiara was worn by Miriam, Pss of Tornovo (the then wife of the Crown Prince Kardam of Bulgaria, deceased in 2015) also in 2004, at the prewedding gala for Pc Frederick and Pss Mary.
The tiara is in gold with small floral motifs, a row of 25 diamonds, and pearls on top. Pc Miriam wore a version with no pearls.
Could the queen be saving it for Leonor or Sofia to wear, or simply its not to her liking? We will have to wait and see. Personally, I donīt think that Pss Leonor will interrupt her military duties to atend a gala event, but in such case I agree she would look stunning in the Mellerio Shell tiara. Or, she would most likely choose the prussian tiara, her grandmothers first tiara.