sentences:  This class, for a short time boasting the largest cruise ships in the world, pioneered the design that has been carried through each modified class.A design difference on these ships is the relocation of the nightclub to directly aft of the funnel, rather than suspended over the stern.The two Gem-class ships, "Diamond Princess" and "Sapphire Princess", are the only two ships based on the "Grand" class to be built at Mitsubishi's Nagasaki Yard.