The most illusive star of Death on the Nile is neither Gal Gadot or Armie Hammer. Nor is it any of the rest of the all-star cast.

It is in fact the incomparable 128-carat Tiffany Diamond.

The jewel, made famous by Audrey Hepburn appears in the new 20th Century Studios daring mystery-thriller, Death on the Nile. In fact this iconic diamond necklace is at the centre of the film's plot.

While we haven't seen much from the film just yet, apart from the first Death on the Nile trailer and a few film stills, we know that the Tiffany Diamond necklace makes its appearance on Gal Gadot's character Linnet Ridgeway Doyle.

This diamond is so illusive, that it's only ever been seen four times in its 143 year history. It was last worn by Lady Gaga at the 2019 Academy Awards.

Prior to that the Tiffany Diamond was worn by Audrey Hepburn in 1961 in the promotional photos from Breakfast at Tiffanys.

It's worth noting that the one that Gal Gadot wears is actually a fanciful recreation of this priceless icon. Filming with the real diamond would surely be a challenge with the intense security detail attached to an artefact like this.

“The Tiffany Diamond is a priceless symbol of the highest standards of virtuosity and craftsmanship at Tiffany, and rarely makes an appearance beyond its vault,” said Reed Krakoff, chief artistic officer.

“A central role in the adaptation of Agatha Christie’s classic novel is deserving of our priceless diamond.”

The Tiffany Diamond, an extremely rare, yellow diamond. It was unearthed in 143 years ago in 1877 - a 287.42-carat rough diamond from the Kimberley mines of South Africa. Later it was procured by Charles Lewis Tiffany. Then, in 1878, the rough diamond was taken to Paris and cut into a 128.54-carat cushion-shape. It's brilliant with an unprecedented 82 facets, revealing the stone’s extraordinary fire and beauty.

Rather than selling this extraordinary piece, Charles Lewis Tiffany chose to keep it as an icon of his brand, sharing it's beauty with the public at strategic moments in time.

Death on the Nile also features a selection of other Tiffany pieces - in fact, select Tiffany & Co. stores with be showing off a collection of yellow diamonds featured in the film. This included exquisite and one-of-a-kind high jewellery pieces, Tiffany & Co. Victoria and Schlumberger designs.

Death on the Nile stars Tom Bateman, Annette Bening, Kenneth Branagh, Russell Brand, Ali Fazal, Dawn French, Gal Gadot, Armie Hammer, Rose Leslie, Emma Mackey, Sophie Okonedo, Jennifer Saunders, and Letitia Wright. It opens on October 23 2020.