What is most valuable single piece of jewelry?

The Hope Diamond is undoubtedly the most valuable single piece of jewelry in the world. It is a 45.52-carat blue diamond, and it is currently housed in the National Museum of Natural History in Washington, D.C. The diamond is named after Henry Philip Hope, a wealthy British collector who purchased it in 1830. The Hope Diamond has been featured in countless books, movies, and TV shows, and it is often considered to be one of the most cursed objects in the world.