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(CNN) --
Catherine, Princess of Wales, delighted Friday night at the 2022 Earthshot Awards by showing off her sustainable style in a rented gown that she accessorized with an emerald choker once worn by her late mother-in-law, Diana.
The Art Deco-style emerald and diamond choker was a favorite of the late Princess of Wales, who daringly wore it on her forehead as a tiara during a 1985 tour of Australia with her then-husband, Prince Charles.
The jewel had been lent to Diana by Queen Elizabeth II.
Prince William and Kate are in the United States for their first trip in eight years
The Princess of Wales decided to cap off the three-day royal trip to the US by pairing the choker with a vibrant green off-the-shoulder gown by Solace London, rented for £74 ($90) on online platform HURR.
Prince William founded the Earthshot Prize in 2020 in hopes of harnessing the world's smartest minds to tackle some of the most pressing environmental challenges facing humanity.
Every year for the next decade, five winners will receive £1 million (about US$1.12 million) to fund their creative solutions.
The event organized this year in Boston was one of the highlights of the Prince of Wales calendar.
Hannah Jones, executive director of the award, called it the future King's "World Cup" moment.
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Speaking at the ceremony, William said: "I think the Earthshot solutions you've seen tonight show that we can overcome our planet's biggest challenges. And by supporting them and helping them grow we can change our future."
"Along with tonight's winners and finalists, and those for years to come, I hope that Earthshot's legacy continues to grow, helping our communities and our planet thrive."
Prince William and Catherine chat with actor Rami Malek.
Earthshot organizers considered sustainability in nearly every aspect of the night.
In an attempt to make the occasion as eco-friendly as possible, all food served was plant-based and single-use plastic was banned, guests were transported to the venue in electric or hybrid vehicles, and an emphasis was placed on contracting of local equipment and equipment.
Like Catherine's wardrobe choice, attendees were encouraged to dress up in vintage ensembles or wear outfits they would re-wear in the future.
Meanwhile, the recycled green carpet, which had previously been used at the inaugural awards in London last year, was adorned with plants grown within a 100-mile radius of the venue that would be donated to community organizations after the dazzling event.
Celebrities in attendance at the awards ceremony included Hollywood actor Rami Malek and former England soccer captain David Beckham, while performers on the night included Annie Lennox, Ellie Goulding and Beyoncé proteges Chloe x Halle.
In a conversation with CNN before the event, Malek praised William for launching the awards and creating a positive approach to addressing the climate crisis.
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"It's extraordinarily inspiring. He's finding answers and the £1 million given to these five people, these five organisations, is something that keeps us from looking into the dark and being pessimistic, and looking ahead of where we can be." to do because when we put our ideas together, we can do extraordinary things," said the 41-year-old "Bohemian Rhapsody" star who later presented the Fix Our Climate award.
The awards ceremony capped a complex visit by the royal couple to Boston, overshadowed by racial controversy surrounding a woman identified as William's godmother, Susan Hussey.
British media reported the resignation of her as royal assistant after she repeatedly questioned a prominent UK-born black charity leader about where she "really came from".
Kate of CambridgePrincessPrincess Diana
