Kate Middleton Wears Jaw-Dropping 100-Year-Old Royal Heirloom

Samir Hussein / Samir Hussein/WireImage Catherine, Princess of Wales, has brought back an iconic royal heirloom for a rare red carpet appearance.

On Sept.

22, Kate and Prince William attended the world premiere of Digger in London, where they showed their support for the Film and TV Charity .

The organization offers physical, mental, and financial help to people in the United Kingdom’s entertainment industry.

The royal couple fit in with the elite Hollywood A-listers in attendance, including Tom Cruise, John Goodman, Jesse Plemons, Sandra Hüller, and Michael Stuhlbarg, as well as soccer legend David Beckham.

Prince William wore a black velvet tuxedo jacket, matching black pants, a white dress shirt, and a black bow tie, while Princess Kate donned a magenta custom Jenny Packham dress with a deep-V neckline, billowy chiffon sleeves, and a dramatic train.

View this post on Instagram A post shared by The Prince and Princess of Wales (@princeandprincessofwales) Kate wore her chestnut hair in long curls, pinned in a half-up style that highlighted her beautiful pearl-drop earrings, which belonged to the late Princess Diana.

The most striking part of her ensemble, however, was a stunning Amethyst Sautoir necklace .

The heirloom has a history stretching back more than a century, having been a gift from Queen Alexandra to Queen Elizabeth II on her wedding day in 1923.

The necklace features diamond and pearl details, with a large amethyst pendant at the center, and paired perfectly with her dress’s neckline and color.

Its massive, heart-shaped centerpiece has frequently drawn comparisons to the “Heart of the Ocean” necklace worn by Rose Dawson (Kate Winslet) in the 1997 James Cameron film Titanic .

Queen Camilla, who is married to King Charles, last wore the jewel in 2012 at the premiere of Skyfall in London.

She paired it with a plum velvet off-the-shoulder gown custom-designed by Bruce Oldfield.

Princess Kate rounded out her accessories with a sentimental ring stack, including her late mother-in-law’s engagement ring as well as her own Welsh gold wedding ring.