Answer:The necklace was given to Rose on board the Titanic by Cal as a symbol of his love and commitment to her, but as the story developed, it was very clear that Cal’s intentions weren’t as sincere as he wanted everything to think. The Heart of the Ocean was the only thing Rose was wearing when Jack made a sketch of her, which she used to let Cal know that she was running away with Jack. The Heart of the Ocean was what set the plot of Titanic into motion as it’s Brock Lovett’s (Bill Paxton) expedition to find the necklace that brings Rose into the mix to share her story, and in the end, it’s revealed that Titanic's Rose had had the necklace all along and finally got rid of it by throwing it into the ocean. While the story of Rose and Jack is fictional, many elements in Titanic were based on real-life people, events, and more, and the Heart of the Ocean might have been inspired by two different diamonds.
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