Princess Kate dazzles in the queen's necklace, also worn by Princess Diana, for 70th anniversary party

Princess Kate was joined at the party by Prince William and Prince Harry.

ByABC News
November 21, 2017, 9:00 AM

— -- Princess Kate borrowed jewels worn by Princess Diana for a black-tie affair to celebrate the 70th wedding anniversary of Queen Elizabeth II and Prince Philip.

Kate, 35, dazzled in a quadruple-strand pearl necklace with a diamond clasp, on loan from the queen, that was also worn by Diana at a banquet in 1982.

PHOTO: Arriving at Windsor Castle are Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge to celebrate Queen Elizabeth II's and Prince Philip, Duke of Edinburgh's 70th wedding anniversary, Nov. 20, 2017, Windsor, England.
Arriving at Windsor Castle are Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge to attend Queen Elizabeth II's and Prince Philip, Duke of Edinburgh's 70th wedding anniversary dinner, Nov. 20, 2017, in Windsor, England.
PHOTO: Queen Elizabeth II wears a four strand diamond and pearl choker with 'Granny's Tiara' to an engagement in Bangladesh, Nov. 16, 1983.
Queen Elizabeth II wears a four strand diamond and pearl choker with 'Granny's Tiara' to an engagement in Bangladesh, Nov. 16, 1983.
PHOTO: Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge arrive at Windsor Castle to attend Queen Elizabeth II's and Prince Philip, Duke of Edinburgh's 70th wedding anniversary dinner, Nov. 20, 2017, in Windsor, England.
Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge arrive at Windsor Castle to attend Queen Elizabeth II's and Prince Philip, Duke of Edinburgh's 70th wedding anniversary dinner, Nov. 20, 2017, in Windsor, England.

Kate complemented the necklace with a pair of drop pearl and diamond earrings from Diana’s private jewelry collection. Kate last wore the Collingwood pearl earrings, which have become a go-to favorite for her, in July at a state banquet at Buckingham Palace for King Felipe and Queen Letizia of Spain.

PHOTO: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a State Banquet at Buckingham Palace on day 1 of the Spanish State Visit, July 12, 2017, in London.
Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a State Banquet at Buckingham Palace on day 1 of the Spanish State Visit, July 12, 2017, in London.

Kate arrived at the anniversary celebration at Windsor Castle with Princes William and Harry. They were joined by Queen Elizabeth and Prince Philip's children, grandchildren and close friends for the dinner.

PHOTO: Britain's Queen Elizabeth and Prince Philip pose for a photograph in the White Drawing Room at Windsor Castle, England in this handout photo issued Nov. 18, 2017, in celebration of their platinum wedding anniversary Nov. 20, 2017.
Britain's Queen Elizabeth and Prince Philip pose for a photograph in the White Drawing Room at Windsor Castle, England in this handout photo issued Nov. 18, 2017, in celebration of their platinum wedding anniversary Nov. 20, 2017.

William and Kate are expecting their third child in April, providing Queen Elizabeth and Prince Philip with their sixth great-grandchild.

PHOTO: Members of the Royal Family stand on the balcony of Buckingham Palace to watch a fly-past of aircraft by the Royal Air Force, in London on June 17, 2017.
Members of the Royal Family (L-R) Prince Edward, Earl of Wessex, Camilla, Duchess of Cornwall, Prince Charles, Prince of Wales, Princess Eugenie of York, Queen Elizabeth II, Vice Admiral Timothy Laurence, Princess Beatrice of York, Prince Philip, Duke of Edinburgh, Catherine, Duchess of Cambridge (with Princess Charlotte and Prince George), and Prince William, Duke of Cambridge, stand on the balcony of Buckingham Palace to watch a fly-past of aircraft by the Royal Air Force, in London on June 17, 2017.

Harry's girlfriend, U.S. actress Meghan Markle, is in London but was absent from Monday's celebration.

It would be unlikely for Markle, 36, to attend the event unless she and Harry, 33, were already engaged. Markle and Harry are expected to celebrate Thanksgiving together later this week.

Earlier Monday, Queen Elizabeth, 91, presented the Duke of Edinburgh, 96, with a special platinum wedding anniversary present.

Buckingham Palace announced she appointed Philip to be a Knight Grand Cross of the Royal Victorian Order for his services to the Sovereign.

PHOTO: Queen Elizabeth II, as Princess Elizabeth, and her husband the Duke of Edinburgh, styled Prince Philip in 1957, on their wedding day. She became queen on her father King George VI's death in 1952.
Queen Elizabeth II, as Princess Elizabeth, and her husband the Duke of Edinburgh, styled Prince Philip in 1957, on their wedding day. She became queen on her father King George VI's death in 1952.

Queen Elizabeth and Prince Philip's anniversary celebration was also marked publicly with the ringing of the bells of Westminster Abbey.

The 21-year-old Princess Elizabeth married then-Lt. Philip Mountbatten at the Abbey Nov. 20, 1947. Five years later, Elizabeth ascended the throne after the death of her father, King George VI.

Buckingham Palace released new photographs of Queen Elizabeth and Prince Philip over the weekend to celebrate their anniversary. The photos were taken by Matt Hollyoak in the White Drawing Room at Windsor Castle in early November.

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