1 of 18
2 of 18
And the woman of the hour, Queen Sonja, wore Empress Joséphine’s Emerald Parure, a perfect pairing with a bright chartreuse gown.
3 of 18
Crown Princess Mette-Marit went for a more subtle look, with the Vifte Tiara, a diamond piece that sat at the top of her braided bun. She's even worn the jewels as a necklace in the past.
4 of 18
A seamless match for her royal blue gown (and the sapphire brooch pinned to her ensemble!), Queen Silvia wore a favorite look of hers, the Leuchtenberg Sapphire Parure Tiara.
5 of 18
There were five representatives from the Danish royal family at the Norwegian celebrations, including the always glam Crown Princess Mary. She wore the newest addition to her tiara repertoire, the Diamond, Ruby, and Spinel Necklace Tiara.
6 of 18
In a blue Elie Saab gown, Crown Princess Victoria went with a sparkling go-to: The Baden Fringe Tiara, which is made up of diamond-shaped points covered in — you guessed it — diamonds.
7 of 18
The most notable thing about Queen Maxima's tiara? It's massive. The Dutch Sapphire Tiara is covered in diamonds, and of course, sapphires, and comes together with a tall point in its center.
8 of 18
9 of 18
For the Queen's Diplomatic Reception in December 2016, Kate wore the pearl and diamond Cambridge Lover's Knot tiara, a favorite piece of Princess Diana's — and the same Jenny Packham dress she wore to the Chinese state banquet.
10 of 18
In her 10-plus years as a royal, Crown Princess Mary of Denmark has cemented her status as a fashion icon. And with pieces like the Danish Ruby Parure Tiara in her jewlery box, it's easy to see why. The floral-inspired piece is covered in diamonds and rubies, and was originally created by one of Napoleon's marshals for his wife.
11 of 18
Queen Margrethe of Denmark wore the Pearl Poire Tiara for a state dinner to honor the visit of King Philippe and Queen Mathilde of Belgium. The pearl and diamond piece is remiscent of Princess Diana's favorite tiara.
12 of 18
Nothing screams "Queen" like a towering tiara covered in diamonds. Queen Letizia of Spain wore this diamond-covered piece, called the Fleur de Lys Tiara, to a dinner with her husband, King Felipe, and the Argentinian president and first lady in Madrid in February 2017.
13 of 18
For Sweden's annual Nobel Prize Banquet in December 2016, Princess Sofia wore this unique piece — a delicate, gem-less, steel-cut silver tiara.
14 of 18
For a dinner for the Nobel laureates the day after the banquet, Sofia broke out another tiara, this one, a bit more traditional: the Diamond Four Button Tiara, which ends in four diamond-covered points. The jewels were taken from Queen Josephine's necklace.
15 of 18
Crown Princess Victoria also attended the Nobel Prize banquet, wearing a tiara similar to the one her sister-in-law wore. Another family favorite piece, this steel-cut tiara has also been seen on her mother, Queen Silvia. And what it lacks in gems, it makes up for in intricate design.
16 of 18
In 2015, Princess Madeleine of Sweden wore some flashy aquamarines on her own tiara, the Aquamarine Kokoshnik tiara, which is seldom seen in public.
17 of 18
For a royal visit to Germany, and dinner at Charlottenburg Palace, Queen Silvia of Sweden wore the Baden Fringe Tiara, which is covered in slim diamond spikes.
18 of 18
This floral tiara, covered in diamonds, has been a favorite for many Spanish royals, including Queen Letizia's mother-in-law, Queen Sofia. Letizia has worn it on a number of occasions, including a gala dinner in Madrid in March 2015.
Find Out What Meghan Markle Wore to Celebrate Suits' 100th Episode — and Get Her Look for Less
See the Swedish Royals’ Perfectly Color-Coordinated Summer Family Photo — in the Palace Backyard!
Prince Albert’s Relationship Advice for Prince Harry and Meghan Markle: ‘Keep Calm and Carry On!’
Prince William and Prince Harry Hadn’t Seen Mom Diana in Nearly One Month Before Her Shocking Death
Elton John Says Prince Harry Inherited Diana's 'Incredible' Gift of Making People Feel 'Everything Was Great'