Side-by-side cruise ship comparison · Updated January 2026
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)
Coral Princess
Costa Diadema
Gross Tonnage
Coral Princess
91,627 GT
Costa Diadema
132,500 GT
Length
Coral Princess
294 m
Costa Diadema
306 m
Beam
Coral Princess
32 m
Costa Diadema
37 m
Passengers
Coral Princess
1,970
Costa Diadema
3,724
Crew
Coral Princess
900
Costa Diadema
1,253
Decks
Coral Princess
—
Costa Diadema
—
Year Built
Coral Princess
2,002
Costa Diadema
2,014
Space Ratio
Coral Princess
46.5 GT/pax
Costa Diadema
35.6 GT/pax
Passenger:Crew Ratio
Coral Princess
2.19 :1
Costa Diadema
2.97 :1
| Specification | Coral Princess | Costa Diadema |
|---|---|---|
| Overview | ||
| Cruise Line | Princess Cruises | Costa Cruises |
| Class | Coral Class | Diadema Class |
| Status | active | active |
| Year Built | 2,002 | 2,014Winner |
| Dimensions | ||
| Gross Tonnage | 91,627 GT | 132,500 GTWinner |
| Length | 294 m | 306 mWinner |
| Beam | 32 m | 37 mWinner |
| Capacity | ||
| Passengers | 1,970 | 3,724Winner |
| Crew | 900 | 1,253Winner |
| Key Ratios | ||
| Space Ratio | 46.5 GT/paxWinner | 35.6 GT/pax |
| Passenger:Crew Ratio | 2.19:1Winner | 2.97:1 |
| Build | ||
| Builder | Chantiers de l'Atlantique | Fincantieri |
| Flag | Bermuda | Italy |
| IMO Number | 9156778 | 9636588 |
Costa Diadema is the significantly larger vessel at 132,500 GT — 45% more than Coral Princess's 91,627 GT. Coral Princess offers more personal space with a space ratio of 46.5 GT per passenger versus 35.6. Built in 2014, Costa Diadema is 12 years newer — an advantage for travellers seeking modern amenities and design.
| Category | Winner |
|---|---|
| Size | Costa Diadema |
| Capacity | Costa Diadema |
| Modernity | Costa Diadema |
| Service | Coral Princess |
| Spaciousness | Coral Princess |
Bottom line: Costa Diadema wins more categories (3 vs 2), making it the stronger all-round choice based on current data.
Coral Princess
47 GT/pax means plenty of quiet space
Well-suited for cruise newcomers
Premium onboard experience
Good range of onboard options
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
Free cancellation on most rooms
Bundle & save on your cruise trip
Medical, trip cancellation & luggage cover
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| Draft | 8.3 m | 8.5 mWinner |
| Decks | — | — |
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