How is the heart of ocean necklace in Smithsonian museum if it not real?

The Heart of the Ocean necklace in the Smithsonian Museum is not the actual necklace from the Titanic movie. It is part of an exhibit about the "Hollywood Myth and Magic" series, and it's just one of the various props displayed with fictional stories. Although fictional and a product of movie props designers, visitors will still appreciate its intricate design and the role it played in depicting a captivating film and historical narrative.