Kate, Princess of Wales, honors Queen Elizabeth and Diana at King Charles' coronation

Thousands of people gathered for King Charles III's coronation on Saturday and Catherine, the Princess of Wales, found a way to honor people who were not there: Queen Elizabeth II and William's mother Diana, the last Princess of Wales before Catherine. 

The princess wore the George VI Festoon Necklace, according to Vogue. The three-strand diamond necklace is significant to the late Queen Elizabeth II and her father, King George. The king commissioned the necklace for his daughter in 1950. 

Queen Elizabeth II has been photographed wearing the stunning jewels several times, including at a sate dinner at the White House with former President George W. Bush in 2007.