The Hope Diamond is a famous blue gemstone weighing 45.52 carats. It is known for its stunning deep blue color, which is caused by the presence of boron in its structure. The diamond has a long history, believed to have originated in India, and has changed hands many times over the centuries. Currently, the Hope Diamond is housed in the Smithsonian National Museum of Natural History in Washington, D.C. It is part of the museum's gem collection and attracts millions of visitors each year. The diamond is also associated with various legends and myths, including claims of a curse on its owners.