In the decade she spent as the Princess of Asturias, Letizia always showed a particular fondness for the glittering Mellerio Floral Tiara. Since the coronation of her husband King Felipe VI – and the one year and five months that have passed – Letizia, as queen, is still remaining loyal to the exquisite piece of jewellery.
The 43-year-old wore the tiara to attend her last gala dinner as a princess, just days before King Juan Carlos I announced that he was stepping down in June 2014.
Letizia also donned the same tiara to make her debut as Spain's new queen at an official banquet.
Letizia wore the Mellerio Floral Tiara at her first official banquet as Spain's new queen
The former journalist has relied on the tiara for state banquets and gala dinners as well as for royal, high-profile events.
She borrowed the floral jewel for Prince Daniel and Princess Victoria of Sweden's wedding in 2010, and again notably wore it at the farewell dinner of Princess Beatrix of the Netherlands, before the monarch abdicated in 2013.
The royal also donned it for the pre-abdication dinner of Princess Beatrix of the Netherlands in 2013
The gem in question was created by French jewellery house Mellerio dits Meller in the late 19th century. The beautiful tiara is made of diamonds in the form of flowers, which are interlaced with leaves and delicate petals.
It was actually a wedding gift from General Franco to Queen Sofia – Letizia's mother-in-law – on the occasion of her marriage to King Juan Carlos I, on behalf of the Spanish people.
Sofia wore it, perhaps for the first time, at her pre-wedding ball in 1962. The elegant Greek princess chose to wear the piece, which is convertible, as a necklace.
The exquisite piece of jewellery was actually first given to Queen Sofia of Spain as a wedding gift in 1962
While Queen Letizia has taken a shine to the tiara and likes to wear it to formal events, other women of the Spanish royal family have also had the honour of borrowing it.
Sofia and King Juan Carlos' daughter Elena, Duchess of Lugo wore the tiara a lot in her younger years, while her sister Cristina used it as her main accessory on her wedding day in 1997.