The blue necklace in Titanic most likely refers to the Heart of the Ocean, a diamond necklace worn by actress Kate Winslet in James Cameron’s 1997 film. While the movie presents it as a priceless jewel owned by the fictional Rose DeWitt Bukater, in real production it was a Cartier piece created for the movie, inspired by historic Art Deco jewelry of the 1910s.
This article explains what the necklace was on screen, how it was made, its design influences, and how accurate the film’s portrayal is compared to actual early-20th-century luxury jewelry. We use production records, auction results, and expert commentary to clarify what is documented and what remains uncertain.