For her husband, Willem-Alexander's investiture in Amsterdam as the King of the Netherlands on 30 April 2013, Queen Maxima wore a royal blue Jan Taminiau gown during the ceremony in the afternoon at the at the Nieuwe Kerk (New Church). It was conducted before the joint assembly of the States General.
Maxima's gown featured lace detailing at the top with a matching cape with a train. The Queen wore her Order of Netherlands Lion sash and the full version of the sapphire and diamond Dutch Sapphire Tiara. About the tiara, Order of Splendor reported, "She made a change to the center top of the tiara, to lower the central element."
All members of the Dutch Royal Family were in attendance as was many European and worldwide royals like Prince Albert of Monaco, Princess Lalla Salma of Morocco (wife to the King), Crown Prince Frederik and Crown Princess Mary of Denmark, the Prince and Princess of Asturias, Prince Charles and the Duchess of Cornwall, and Crown Prince Haakon and Crown Princess Mette-Marit of Norway.
Maxima is also pictured in the same outfit in an official photo on the Royal House of the Netherland's website.
Photo: RVD
Then-Queen Beatrix signed the instrument of abdication at the Moses Hall that morning after announcing her intent to abdicate in January of that year.
Willem-Alexander was one of four new monarchs who took the throne in 2013. The others were King Philippe of the Belgians, Pope Francis, and Emir Tamim bin Hamad of Qatar. At the time, he was the youngest monarch in the world. He held that title until Felipe of Spain took the throne on June 19, 2014.