Diamond Princess was the first of two Gem-class ships by Princess Cruises, she was the first Gem-class ship to be built in Japan instead of Italy. Gem-class is a modification of the original Grand-class design.
She primarily sails from her summer homeport of Yokohama, Japan to ports such as Tokyo or Kobe. In the winter she home-ports in Singapore. From 2017-18 she will be moved back to her original homeport of Sydney for Australia and New Zealand voyages.
Diamond Princess was the first Gem-class ship to be built without the “spoiler” across the rear of the ship. This design wasn’t used anymore as it creates a drag on the ship and increases fuel usage by around 4-5%