Kate Wears Princess Diana's Emerald Choker at Earth shot Awards!

At Friday's Earth shot Prize Awards, Kate Middleton donned Princess Diana's emerald and diamond choker.

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The exquisite piece has yet to be seen since Diana wore it. She wore it as a headband in 1985 while touring Australia with Prince Charles.

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Diana accidentally wore it as a headband. According to royal writer Kitty Kelley, she tried to put it over her head instead of around her neck,

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but the choker got trapped. For the evening, she wore it across her forehead.

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Queen Mary received the emerald choker from the Ladies of India in 1911. Queen Elizabeth gave it to Diana after her wedding to Charles.

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Prince William and Prince Harry gave their wives numerous pieces of their mother's jewelry.

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Kate, like Diana, wore the necklace with a brilliant green dress.

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Kate leased the off-the-shoulder Space London gown from U.K. designer dress rental site HURR to comply with the Earth shot Prize Awards' sustainable fashion theme.

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Kate and William ended their three-day journey to Boston with the environmental awards event on Friday. To fight climate change, William founded the Earth shot Prize in 2020.

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The Prince of Wales launched the 2020 Earth shot Prize Awards to inspire urgent optimism about climate change and environmental challenges.

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A source close to the duo tells PEOPLE that he and Princess Kate are "eager to be able to bring it to the United States

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and inspire people stateside and across the world through the wonderful stories we will share."

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