$353/person$118/night
View DealShip comparison
Costa Diadema vs Costa Smeralda
Side-by-side cruise ship comparison. Costa Smeralda wins 5 of 7 scored categories.
At a glance
Quick Compare
Category
Costa Diadema
Costa Smeralda
Size
132,500 GT
185,010 GT
Passengers
3,724
5,224
Year built
2014
2019
Crew ratio
3.0 guests per crew
3.1 guests per crew
Space ratio
35.6 GT per guest
35.4 GT per guest
Decks
No data
No data
Length
306 m
337 m
From price
$353 pp
$491 pp
The verdict
Comparison Verdict
Costa Smeralda is the significantly larger vessel at 185,010 GT, 40% more than Costa Diadema's 132,500 GT. Built in 2019, Costa Smeralda is 5 years newer, an advantage for travelers seeking modern amenities and design. Costa Diadema edges ahead in service at 3.0 guests per crew, meaning more crew per guest.
| Category | Winner |
|---|---|
| Size | Costa Smeralda |
| Capacity | Costa Smeralda |
| Modernity | Costa Smeralda |
| Service | Costa Diadema |
| Spaciousness | Costa Diadema |
| Decks | No data |
| Length | Costa Smeralda |
| Fleet Power | Costa Smeralda |
Bottom line: Costa Smeralda leads 5–2 across our categories, strongest in Size. Choose Costa Smeralda for overall superiority; pick Costa Diadema if Service matter more to you.
Decide
Which Ship Is Right for You?
Choose Costa Diadema if
- More crew per guest (3.0 guests per crew)
- More space per guest (35.6 GT per guest)
Choose Costa Smeralda if
- You want the newer ship (built 2019, 5 years newer)
- Size matters to you (185,010 GT)
- More onboard variety (5,224 guests)
- Lower fares per night (from $70 per person per night)
Prices
See Current Prices
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Fares
Sailing Prices
| Detail | Costa Diadema | Costa Smeralda |
|---|---|---|
| Cheapest | $353 pp | $491 pp |
| Per night | $118 pp | $70 pp |
| Departing | Oct 31 | Oct 31 |
| Duration | 3 nights | 7 nights |
| View sailing | View sailing |
Prices from Cruisebound, per person, for the sailing shown.
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FAQ
Frequently Asked Questions
How is the comparison score calculated?
We score 8 categories from spec data: size, capacity, modernity, service, spaciousness, decks, length and fleet power. Each category awards one point to the winning ship. A category where either ship has no data is marked No data and left out of the score.
What is the space ratio and why does it matter?
Space ratio is gross tonnage divided by passenger capacity. A higher number means more space per guest. Luxury lines typically score above 40, and mass-market ships often fall between 30 and 40.
What does the passenger-to-crew ratio mean?
It is the number of guests for each crew member, shown as "3.0 guests per crew". Lower is better: more staff per guest usually means more attentive service. Luxury lines aim for fewer than 2 guests per crew, and large mainstream ships often carry 3 to 4.
Are the prices shown accurate?
Prices come from Cruisebound and are per person for the sailing shown. They change with cabin type, date and demand, so open the sailing to see the current fare.
Can I compare more than two ships?
Yes, up to four ships. Use the search tool on the compare hub page to add additional ships.
How current is the ship data?
Specifications come from our database of 380+ ships, and this page refreshes daily. An "Updated" date appears at the top when either ship's record changed in the last 30 days.
