The ship
Enlarged Dream-class Italian boulevard
Costa Diadema is enlarged Dream-class Costa from 2014 — one of the line’s bigger Italian spectacle ships before the Excellence pair, with room for about 3,720 guests and a long central boulevard of bars and shops.
Main dining and the buffet are included. Specialty steakhouse, premium Italian and Asian nights carry covers; Samsara Restaurant suits wellness keys when fitted.
Evenings run through the theatre and galleria bars. Daytime is pools and Samsara spa. She is big-ship Costa sparkle — lively Italian holiday energy at a scale just below Smeralda and Toscana.
Diadema is enlarged Dream-class Costa: a long boulevard, Italian sparkle and a theatre week at nearly 3,700 guests.
On board
Boulevard, dining, theatre
- 01
Italian dining map
Main dining rooms and the buffet are included. Specialty steakhouse, premium Italian and Asian nights carry covers; Samsara Restaurant suits wellness keys when fitted. Reserve specialty early on sea days. Drink packages sit outside the simple cruise.
- 02
Theatre
The theatre runs Costa production shows and guest acts — Italian big-ship spectacle, not a West End transfer. Programmes change by season. Book centre seats on night one if the headline matters.
- 03
Galleria after dark
The long central boulevard of bars, lounges and the casino carry the after-dinner wander. Drinks sit outside the cruise. The mood is Italian holiday sparkle at large-ship volume.
- 04
Pools and Samsara spa
Pool decks take daytime sun. Samsara spa sells treatments and thermal access as extras. Grab shade early — with nearly 3,700 guests, the same rails fill quickly.
- 05
Families and fit
Kids’ clubs fill in school holidays. Multi-gen groups who will use the boulevard, theatre and specialty nights get the most from Diadema. Guests wanting a quiet mid-size ship should look smaller.
Specialty steakhouse
The specialty steakhouse is one of the pricier covers on Costa Diadema. Quieter and more dressed-up than the buffet. Go here for a splurge dinner. Book early on sea days.
Premium Italian
Premium Italian specialty is a paid occasion night. Mid-to-upper spend versus included dining. Book early if Italian fine dining is your treat.
Asian specialty
Asian specialty is a lighter paid night than the steakhouse. Cover charge applies. Best when you want spice and small plates.
Samsara Restaurant
Samsara Restaurant serves wellness-leaning menus, often tied to Samsara cabin keys. Confirm whether a cover applies on your sailing.
Main dining rooms
Main dining rooms are the included plated core. Proper sit-down meals without a cover. Best for most evenings.
Buffet
The buffet covers breakfast, lunch and casual evenings. Included once aboard. Quickest seat on a port morning.
Theatre
The theatre houses Costa Diadema’s production nights — Italian big-ship spectacle, not a West End transfer. Titles change by season; check your sailing.
Galleria bars
Galleria bars along the central boulevard carry the after-dinner wander. Drinks sit outside the simple cruise.
Samsara spa
Samsara spa treatments and thermal access are extras — not included in the simple cruise. Book ahead on sea days.
Pool bar
The pool bar covers daytime drinks and sail-away. Grab shade early on warm sea days.
Fit
Who she is for
- Guests who want Costa’s Italian large-ship holiday — boulevard nightlife, specialty dining and Samsara spa — without Excellence-class height.
- Multi-gen groups happy to budget drinks and specialty nights on Mediterranean weeks.
- Not the ship if you want a small traditional liner, quiet British formal dining, or Excellence-class galleria scale.
Where
Where Diadema tends to go
Western Mediterranean and other European seasons are typical; Costa may send her farther as the fleet plan changes.
Treat this as the ship’s range, not a fixed timetable. When this guide is public, sailings with two or more UK agent prices will sit at the bottom.
Before you book
What the brochure skips
- Specialty dining, drink packages, Samsara or spa extras and Wi-Fi sit outside the simple cruise on most Costa bookings. Price the week as the cruise plus what you will actually buy.
- Compare UK agents on the same Diadema sailing — same ship, same date, cruise-only, two guests. The hero price should be the lowest bookable one, not the first logo you recognise.
Next step
Find a sailing
Compare cruise prices for Costa Diadema, or open the live map and see where she is now.
Compare all Costa Cruises prices