As ninth in line to the throne, Princess Eugenie gets to have her royal cake and eat it too. She’s allowed to have an Instagram account and can rock any color of nail polish she wants. But why have we never seen her in a tiara?

Although she could wear one if she wanted to, according to British royal rule, a woman should only don a tiara as a bride or after she’s married. And since Eugenie’s wedding isn’t until October 12, it’d be a royal faux pas if she did.

As jewelry expert Geoffrey Munn told Town and Country, “Any woman may wear one, but ancient tradition has it that they must be a bride or already married ... One of the mainstays of European royalty and aristocracy is to do what you have always done and formal dress, jewelry, and tiaras are just a part of this.”

Got it. So, when Princess Eugenie is allowed to wear one, which will she choose? Well, it’s expected that she’ll opt for the York Tiara, which her mother, Sarah Ferguson, wore on her wedding day.

Sarah Ferguson on wedding day
PA Images/Getty Images

The diamond-adorned scroll tiara was designed by Garrard, which was the crown jeweler at the time and also designed Fergie and Princess Diana’s engagement rings.

Time will tell what tiara Princess Eugenie rocks on her big day, but we’re looking forward to her to crossing this royal right of passage off her to-do list.

RELATED: Who Is Princess Eugenie Marrying? Everything You Need to Know About Jack Brooksbank

From Around The Web

The News—But Only the Fun Stuff—
Delivered Right to Your Inbox.