The Spirit of de Grisogono, at carats, is the world’s largest cut black diamond (extremely rare), and world’s largest diamond. When it was discovered the Spirit of de Grisogono weighted 587 carats the largest natural black diamond ever found.
The Regent Diamond or Pitt Diamond, once owned by Thomas Pitt, Governor of Madras. Thomas (known as "Diamond Pitt") was the Younger Pitt's great grandfather. The diamond, one of the largest known at the time, was purchased for the French Crown in
Spirit of de Grisogono. The largest cut black diamond in the world is also the world's fifth-largest diamond of any kind It was 587 carats before it was cut. It is set in a ring that contains 702 white diamonds.
The Hope Diamond is one of the most famous diamonds in the world. It is currently housed in the Smithsonian Natural History Museum in the USA. The Hope Diamond weighs carats is graded as is Dark blue in color.