At the 2022 Earthshot Prize Awards ceremony in Boston, Massachusetts, Kate Middleton channeled her late mother-in-law, Princess Diana.

When she and her husband, Prince William, came to the MGM Music Hall for the second annual awards ceremony for the Prince of Wales’s environmental initiative, the Princess of Wales turned heads in a bright green gown with a bateau neckline and long sleeves.

According to Page Six, Middleton rented her off-the-shoulder Solace London “Sabina” dress ($525) from rental platform Hurr because the Earthshot Prize Awards have a sustainable fashion theme.

She wore her hair in soft waves and wore drop earrings as well as Princess Diana’s iconic emerald-and-diamond choker necklace. She finished off her look with a pair of gleaming gold heels.

The gleaming emerald choker hasn’t been seen since Princess Diana wore it in 1997. According to The Court Jeweller, the piece was created “by redesigning an emerald and diamond necklace that was presented to [Queen] Mary during the Delhi Durbar in 1911.”

One Twitter user commented:

“Always appropriate and tasteful.”

Another added:

“Wow Princess Catherine, absolutely stunning.”

A third user wrote:

“Not the dress I was expecting at all, but what a statement to make! Knocking it out of the park at Earthshot Boston 2022!”

A different person opined:

“I absolutely ABSOLUTELY adore Catherine, Princess of Wales in green. And the neon green with the emerald choker is [kiss and heart emojis].”

Prince William, for one, looked sharp in a velvet tuxedo jacket and black slacks.

In 2020, the heir to the British throne established the Earthshot Prize to incentivize environmental change and aid in the repair of the planet over the next decade. It was inspired by President John F. Kennedy’s iconic “Moonshot,” a decade-long mission to land a man on the moon in 1961.

Protect and Restore Nature, Clean our Air, Revive our Oceans, Build a Waste-Free World, and Fix our Climate were the five Earthshot categories.

At the awards ceremony, each of the five global winners received $1.2 million.

The Prince of Wales said during the ceremony, according to Page Six:

“I believe that the Earthshot solutions you have seen this evening prove we can overcome our planet’s greatest challenges. And by supporting and scaling them, we can change our future.”

He continued:

“Alongside tonight’s winners and finalists, and those to be discovered over the years to come, it’s my hope the Earthshot legacy will continue to grow, helping our communities and our planet to thrive.”