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On Saturday, the Grimaldis gathered in Monaco for the annual Bal de la Rose, the annual gala that benefits the Princess Grace Foundation.

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The gala’s decor and theme have often been designed by the late Karl Lagerfeld, who was a close friend of Princess Caroline of Monaco. This year’s theme, “Riviera,” was a collaboration between the two. (See more images of Karl and Caroline together at past Rose Balls over here!)

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Longtime readers of The Court Jeweller will surely immediately recognize Princess Caroline’s jewels for this year’s ball.

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They’re her mother’s pearls — more specifically, the diamond and pearl suite made by Van Cleef and Arpels that Prince Rainier gave Princess Grace as a wedding present. The set includes a necklace, bracelet, earrings, and a ring. (Read more about it over here!)

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Caroline wore the complete set for this year’s Rose Ball. Here you can see the earrings and the necklace.

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She wore the bracelet on her left wrist.

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And the ring can be seen here on her right hand. You’ll also spot another pearl ring on her left hand.

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As they often do, Princess Caroline’s children and their partners also attended the Rose Ball this year.

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Tatiana Casiraghi sported a gorgeous pair of elaborate diamond earrings.

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She also wore a gorgeous diamond bracelet on her left wrist.

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Charlotte Casiraghi attended the gala with her partner, Dimitri Rassam. Last October, the couple welcomed their first child together, a son named Balthazar.

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Charlotte wore a modern gold and diamond necklace with her ensemble.

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She also wore a tennis bracelet on her left wrist, and a diamond ring on her left hand.

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Beatrice Casiraghi sparkled in a pair of classic diamond stud earrings and a gorgeous diamond statement necklace.

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Alexandra of Hanover, Caroline’s younger daughter, wore statement earrings with her sequinned dress.

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One of Caroline’s stepsons, Christian of Hanover, attended the gala with his wife, Alessandra.

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She wore a sleek, modern pair of diamond earrings.

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And there were more royals among the guests at the gala, too. Carlos and Camilla of Bourbon-Two Sicilies live in Monaco, and they are frequent attendees of the Rose Ball.

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The showstopping diamond and emerald ring on Camilla’s left hand was undoubtedly the highlight of her ensemble for the event.