Side-by-side cruise ship comparison · Updated January 2026
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across 5 categories
Size
Based on gross tonnage and length
Capacity
Based on passengers and crew
Modernity
Based on year built
Service
Based on passenger-to-crew ratio (lower is better)
Spaciousness
Based on gross tonnage per passenger (higher is better)
Costa Diadema
Costa Pacifica
Gross Tonnage
Costa Diadema
132,500 GT
Costa Pacifica
114,500 GT
Length
Costa Diadema
306 m
Costa Pacifica
290 m
Beam
Costa Diadema
37 m
Costa Pacifica
36 m
Passengers
Costa Diadema
3,724
Costa Pacifica
3,012
Crew
Costa Diadema
1,253
Costa Pacifica
1,110
Decks
Costa Diadema
—
Costa Pacifica
—
Year Built
Costa Diadema
2,014
Costa Pacifica
2,009
Space Ratio
Costa Diadema
35.6 GT/pax
Costa Pacifica
38.0 GT/pax
Passenger:Crew Ratio
Costa Diadema
2.97 :1
Costa Pacifica
2.71 :1
| Specification | Costa Diadema | Costa Pacifica |
|---|---|---|
| Overview | ||
| Cruise Line | Costa Cruises | Costa Cruises |
| Class | Diadema Class | Concordia Class |
| Status | active | active |
| Year Built | 2,014Winner | 2,009 |
| Dimensions | ||
| Gross Tonnage | 132,500 GTWinner | 114,500 GT |
| Length | 306 mWinner | 290 m |
| Beam | 37 mWinner | |
| Capacity | ||
| Passengers | 3,724Winner | 3,012 |
| Crew | 1,253Winner | 1,110 |
| Key Ratios | ||
| Space Ratio | 35.6 GT/pax | 38.0 GT/paxWinner |
| Passenger:Crew Ratio | 2.97:1 | 2.71:1Winner |
| Build | ||
| Builder | Fincantieri | Fincantieri |
| Flag | Italy | Italy |
| IMO Number | 9636588 | 9343144 |
Costa Diadema is the larger vessel at 132,500 GT — 16% more than Costa Pacifica's 114,500 GT. Built in 2014, Costa Diadema is 5 years newer — an advantage for travellers seeking modern amenities and design. Costa Pacifica edges ahead in service with a passenger-to-crew ratio of 2.7:1, meaning more crew per guest.
| Category | Winner |
|---|---|
| Size | Costa Diadema |
| Capacity | Costa Diadema |
| Modernity | Costa Diadema |
| Service | Costa Pacifica |
| Spaciousness | Costa Pacifica |
Bottom line: Costa Diadema wins more categories (3 vs 2), making it the stronger all-round choice based on current data.
Costa Diadema
Large 3,724-guest capacity offers competitive pricing
Well-suited for cruise newcomers
3,724 passengers means tons of activities
Comfortable atmosphere for two
Costa Pacifica
Well-suited for cruise newcomers
Large 3,012-guest capacity offers competitive pricing
3,012 passengers means tons of activities
Comfortable atmosphere for two
Free cancellation on most rooms
Bundle & save on your cruise trip
Medical, trip cancellation & luggage cover
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36 m |
| Draft | 8.5 mWinner | 8.3 m |
| Decks | — | — |
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