So we can't help wondering why we've never seen either of them wear a tiara.
They're royals, so surely they've got a crown or two tucked away somewhere?
Well, maybe so – but it would go against royal protocol if they wore them out in public.
According to jewellery expert Geoffrey Munn, they can't wear the sparkling accessory because they're both unmarried.
He told Town & Country: "Any woman may wear one, but ancient tradition has it that they must be a bride or already married.
"The tiara has its roots in classical antiquity and was seen as an emblem of the loss of innocence to the crowning of love.
"One of the mainstays of European royalty and aristocracy is to do what you have always done, and formal dress, jewellery, and tiaras are just part of this."
We reckon it won't be long before we see Eugenie in her first tiara – when she marries fiancé Jack Brooksbank on October 12.
The 28-year-old is due to tie the knot at St George's Chapel, Windsor Castle, and she'll have a number of glittering pieces at her disposal.
Royal fans have speculated that she could pay tribute to her mother Sarah Ferguson with her choice, by sporting the same tiara Fergie wore for her wedding to Prince Andrew in 1986.
The Duchess of York’s headpiece was gifted to her by the Queen, and was made by jewellers Garrard.
Personal stylist Anne Mewes recently told The Express: “She will almost certainly wear a tiara and I think it would be a lovely touch if she opted for the same one her mother wore for her wedding to the Duke of York."
But unfortunately for Eugenie, whichever stunning sparkler she goes for may be her last as well as her first.
She and Beatrice, 30, are not considered to be senior working members of the Royal Family, despite being the Queen’s granddaughters.
This means they'll rarely, if ever, be required to attend formal events that warrant donning a tiara.
Kate Middleton has only ever been seen in one at state banquets or diplomatic receptions at Buckingham Palace.
These aren't the types of events that Beatrice and Eugenie are expected to attend.
With that in mind, we hope Eugenie nabs the flashiest tiara in the whole Palace for her big day.
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