Side-by-side cruise ship comparison · Updated February 2026
.jpg%26w%3D400&w=3840&q=75)
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 Luminosa
Gross Tonnage
Costa Diadema
132,500 GT
Costa Luminosa
92,720 GT
Length
Costa Diadema
306 m
Costa Luminosa
292 m
Beam
Costa Diadema
37 m
Costa Luminosa
32 m
Passengers
Costa Diadema
3,724
Costa Luminosa
2,260
Crew
Costa Diadema
1,253
Costa Luminosa
934
Decks
Costa Diadema
—
Costa Luminosa
—
Year Built
Costa Diadema
2,014
Costa Luminosa
2,009
Space Ratio
Costa Diadema
35.6 GT/pax
Costa Luminosa
41.0 GT/pax
Passenger:Crew Ratio
Costa Diadema
2.97 :1
Costa Luminosa
2.42 :1
| Specification | Costa Diadema | Costa Luminosa |
|---|---|---|
| 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 | 92,720 GT |
| Length | 306 mWinner | 292 m |
| Beam | 37 mWinner | |
| Capacity | ||
| Passengers | 3,724Winner | 2,260 |
| Crew | 1,253Winner | 934 |
| Key Ratios | ||
| Space Ratio | 35.6 GT/pax | 41.0 GT/paxWinner |
| Passenger:Crew Ratio | 2.97:1 | 2.42:1Winner |
| Build | ||
| Builder | Fincantieri | Fincantieri |
| Flag | Italy | Italy |
| IMO Number | 9636588 | 9343132 |
Costa Diadema is the significantly larger vessel at 132,500 GT — 43% more than Costa Luminosa's 92,720 GT. Costa Luminosa offers more personal space with a space ratio of 41.0 GT per passenger versus 35.6. Built in 2014, Costa Diadema is 5 years newer — an advantage for travellers seeking modern amenities and design.
| Category | Winner |
|---|---|
| Size | Costa Diadema |
| Capacity | Costa Diadema |
| Modernity | Costa Diadema |
| Service | Costa Luminosa |
| Spaciousness | Costa Luminosa |
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 Luminosa
Well-suited for cruise newcomers
41 GT/pax means plenty of quiet space
Good range of onboard options
Good value for money
Free cancellation on most rooms
Bundle & save on your cruise trip
Medical, trip cancellation & luggage cover
We may earn a commission from partner bookings at no extra cost to you.
32 m |
| Draft | 8.5 m | — |
| Decks | — | — |
.jpg%26w%3D400&w=3840&q=75)
_in_Venice.jpg%26w%3D400&w=3840&q=75)
.jpg%26w%3D400&w=3840&q=75)