Catherine, Princess of Wales wears Queen Mother's amethyst necklace not seen since 2012

Catherine, Princess of Wales wore the Queen Mother's Amethyst Sautoir Necklace, a long strand with amethysts, diamonds and pearls, to the 'Digger' world premiere in London. The piece, a 1923 wedding gift to the future Queen Mother, was last worn in public by Queen Camilla at the 2012 'Skyfall' premiere.