The late Princess of Wales wore the diamond and pearl earrings for several black tie events, including to a 1990 banquet held in honour of the Emperor Akihito of Japan.
The Duchess, who spoke at a children's mental health conference, shared her own experience as a mother to Prince George, Princess Charlotte and Prince Louis to help draw attention to developing research into the early years. Although they are more reserved when it comes to public display of affection compared to Prince Harry and Meghan Markle, they set the precedent of modern courtship.
The duchess was attending a gala dinner at the Victoria and Albert Museum.
Tonight the sparkling creations were the flawless counterpoint to the softness of Kate's blush pink gown, which was made for the royal by Gucci.
The conference was hosted by the Duke and Duchess of Cambridge and Duke and Duchess of Sussex's The Royal Foundation.
"It is clear that the positive development of our children is directly linked to those who care for them, teachers, carers and parents", she stated.
During the discussion, Kate said she was "very naive" as a parent about the importance of a child's early development for their future. Shiny, sleek and perfectly coiffed - it looked like something from a TV advert, particularly as she had zero split ends, and no pesky flyaway hairs.