Fares per person start at €131 on Costa Diadema and €163 on Costa Pacifica. Costa Pacifica is the cheapest per night, at €60 per person. Costa Diadema is the bigger ship, carrying 3,724 guests to 3,014. Costa Pacifica has the fewest guests per crew member, at 2.7 to 1. Costa Diadema is newer, built in 2014 against 2009, though Costa Pacifica was refurbished in 2022.