The Heart of the Ocean (also known as Le Cœur de la Mer) is the name of a fictional blue diamond featured prominently in the 1997 film Titanic. In the story, the diamond was originally owned by Louis XVI and cut into a heart shape after the French Revolution. Caledon Hockley (Billy Zane), the wealthy son of a Pittsburgh steel tycoon, purchased the diamond for his fiancée Rose DeWitt Bukater (Kate Winslet).
Famed jeweller Harry Winston created a replica of the necklace from the titanic using real jewels. At the ‘heart’ of the piece is a 15-carat blue diamond. Gloria Stewart, the actress who played the elderly ‘Rose’ in the film, wore the creation to the Oscars. The necklace is worth an estimated $20 Million.