Diamond Cruise Ltd. and Radisson Hotels International have announced that the second twin-hulled cruise ship, the Radisson Ruby, has now been contracted to be built by Rauma Yards of Finland.

While the sistership, the Radisson Diamond, is being constructed for $125 million and will be launched in May, 1992, the second ship will cost $140 million and will be launched in 1993.

Both vessels will be 18,000 tons and have 177 suites for 354 passengers.

No decision has been made at this time on the itineraries or homeport for the Radisson Ruby. The Radisson Diamond is scheduled for summer 1992 cruises in the Mediterranean; in the fall, she will homeport out of San Juan for Caribbean cruises.

Diamond Cruise Ltd. also holds an option on a third twin-hulled vessel.