Kate Middleton
Kate Middleton wears a pair of Kiki McDonough earrings in most of her royal engagements. Pictured: Middleton leave the wedding of Britain's Princess Eugenie of York to Jack Brooksbank at St George's Chapel, Windsor Castle, in Windsor, on Oct. 12, 2018. Getty Images/Gareth Fuller

Kate Middleton seems to be a big fan of one particular brand of jewelry.

The Duchess of Cambridge is known for embracing the fashion and styles that she knows works well for her. In fact, she is popular for recycling dresses and sporting her own signature bouncy curls. As such, it comes as no surprise that she often wears a pair of earrings from the same brand.

According to Harper's Bazaar, Prince William's wife turns to one jewelry designer for almost every occasion, Kiki McDonough. Middleton's colorful gems and intricate earrings for both formal and casual engagements are more often than not designed by McDonough.

In the photos shared by the publication, Middleton has been photographed wearing an impressive collection from the brand. For instance, the royal mom of three wore their green tourmaline and green amethyst gold drop earrings during St. Patrick's Parade Day in 2017.

She also wore a pair of lemon quartz pear and oval drop earrings from the same company for Prince Harry and Meghan Markle's royal wedding. In addition, she has worn the Grace white topaz stud, Morganie double drop, Lauren yellow gold pave diamond leaf, candy pink tourmaline and green amethyst drop earrings and more from the same brand.

Just recently, the Duchess of Cambridge and Duchess of Sussex's fashion choices were examined by Dr. Anna Akbari, an author and former professor at NYU and Parsons who specializes in the sociology of style and self-presentation. Based on her observation, Middleton's style is "pretty timeless and hard to critique."

"She's mastered that look, and it suits her. Imagining Meghan Markle in the same style would feel forced—she's never been preppy, so it would be weird to see her fully embracing that." Akbari explained.

On the other hand, Markle reportedly felt that she had to prove herself. This shows in the former "Suits" star's choice of wedding gown and the changes in her wardrobe since she joined the royal family.

"Prior to her engagement, we saw more of a Hollywood-chic aesthetic—artfully distressed with an eye on trends. This is a moment where we see a shift into royal formality. She knows there will be different expectations now that she's entered the family, and that transition is reflected in her style choices," Akbari said about the pregnant royal.