Costa Diadema

Costa Diadema current position

Costa Diadema current location is at South America East Coast (coordinates 1.24629 N / -30.31396 W) cruising at speed of 12.4 kn (23 km/h | 14 mph) en route to Maceio. The AIS position was reported 30 minutes ago.

All Itineraries Current Position

Current itinerary of Costa Diadema

Costa Diadema current cruise is 16 days, one-way from Marseille to Salvador de Bahia. Prices start from USD 927 (double occupancy rates). The itinerary starts on 29 Nov, 2024 and ends on 15 Dec, 2024.

Date / TimePort
29 Nov 18:00    Departing from Marseille, France Riviera hotels
30 Nov 09:00 - 16:30    Genoa, Milan, Italy Riviera
01 Dec 14:00 - 20:00    Barcelona, Spain
03 Dec 09:00 - 17:00    Cadiz, Spain, Sevilla
05 Dec 10:00 - 19:00    Las Palmas de Gran Canaria, Canary Islands
08 Dec 09:00 - 19:00    Praia, Santiago Island Cape Verde
14 Dec 07:00 - 17:00    Maceio, Brazil
15 Dec 13:00    Arriving in Salvador de Bahia, Brazil hotels

Specifications of Costa Diadema

Year of build2014  /  Age: 10
Flag state Italy
BuilderFincantieri (Marghera, Italy)
ClassCCL DREAM
Building costEUR 550 million (USD 735 million)
Speed22 kn / 41 km/h / 25 mph
Length (LOA)306 m / 1004 ft
Beam (width)36 m / 118 ft
Gross Tonnage132500 gt
Passengers3772 - 4526
Crew1253
Passengers-to-space ratio29
Decks14
Cabins1886
Decks with cabins9
Last Refurbishment2023
Sister-shipsCarnival Breeze, Carnival Dream, Carnival Magic
Christened byCarolina Miceli
OwnerCarnival Corporation & PLC
OperatorCosta Cruises

Costa Diadema Itineraries

DateItineraryDeparture PortPrice from
2024 Nov 28 3 days, round-trip Mediterranean from Barcelona From Barcelona Barcelona
2024 Nov 29 6 days, one-way from Marseille to Las Palmas de Gran Canaria Marseille
2024 Nov 29 16 days, one-way from Marseille to Salvador de Bahia Marseille $927
2024 Nov 29 19 days, one-way from Marseille to Rio de Janeiro Marseille $1049
2024 Nov 29 21 days, one-way from Marseille to Itajai Marseille $1116
2024 Nov 29 22 days, one-way from Marseille to Santos Marseille $1211
2024 Nov 30 5 days, one-way from Genoa to Las Palmas de Gran Canaria Genoa $793
2024 Nov 30 14 days, one-way from Genoa to Maceio Genoa $1346
2024 Nov 30 15 days, one-way from Genoa to Salvador de Bahia Genoa $895
2024 Nov 30 18 days, one-way from Genoa to Rio de Janeiro Genoa $1027
2024 Nov 30 20 days, one-way from Genoa to Itajai Genoa $1804
2024 Nov 30 21 days, one-way from Genoa to Santos Genoa $1139
2024 Dec 01 4 days, one-way from Barcelona to Las Palmas de Gran Canaria Barcelona
2024 Dec 01 13 days, one-way from Barcelona to Maceio Barcelona $1275
2024 Dec 01 14 days, one-way from Barcelona to Salvador de Bahia Barcelona $853
2024 Dec 01 17 days, one-way from Barcelona to Rio de Janeiro Barcelona
2024 Dec 01 19 days, one-way from Barcelona to Itajai Barcelona $1723
2024 Dec 01 20 days, one-way from Barcelona to Santos Barcelona $1097
2024 Dec 05 10 days, one-way from Las Palmas de Gran Canaria to Salvador de Bahia Las Palmas de Gran Canaria $1167
2024 Dec 21 3 days, one-way from Santos to Buenos Aires Santos $603
2024 Dec 21 6 days, one-way from Santos to Itajai Santos $1000
2024 Dec 21 7 days, round-trip South America from Santos From Santos Santos $1254
2024 Dec 24 7 days, round-trip South America from Buenos Aires From Buenos Aires Buenos Aires $1925
2024 Dec 27 7 days, round-trip South America from Itajai From Itajai Itajai $1317
2024 Dec 28 7 days, round-trip South America from Santos From Santos Santos $1364
2024 Dec 31 7 days, round-trip South America from Buenos Aires From Buenos Aires Buenos Aires $1490
2025 Jan 03 7 days, round-trip South America from Itajai From Itajai Itajai $1087
2025 Jan 04 7 days, round-trip South America from Santos From Santos Santos $1134
2025 Jan 11 7 days, round-trip South America from Santos From Santos Santos $1064
2025 Jan 12 7 days, round-trip South America from Itajai From Itajai Itajai $1017
2025 Jan 15 7 days, round-trip South America from Buenos Aires From Buenos Aires Buenos Aires $1515
2025 Jan 18 7 days, round-trip South America from Santos From Santos Santos $1384
2025 Jan 19 7 days, round-trip South America from Itajai From Itajai Itajai $1337
2025 Jan 22 7 days, round-trip South America from Buenos Aires From Buenos Aires Buenos Aires $1375
2025 Jan 25 7 days, round-trip South America from Santos From Santos Santos $1034
2025 Jan 26 7 days, round-trip South America from Itajai From Itajai Itajai $987
2025 Jan 29 7 days, round-trip South America from Buenos Aires From Buenos Aires Buenos Aires $1375
2025 Feb 01 7 days, round-trip South America from Santos From Santos Santos $1024
2025 Feb 02 7 days, round-trip South America from Itajai From Itajai Itajai $977
2025 Feb 05 7 days, round-trip South America from Buenos Aires From Buenos Aires Buenos Aires $1305
2025 Feb 08 7 days, round-trip South America from Santos From Santos Santos $1024
2025 Feb 09 7 days, round-trip South America from Itajai From Itajai Itajai $977
2025 Feb 12 7 days, round-trip South America from Buenos Aires From Buenos Aires Buenos Aires $1245
2025 Feb 15 7 days, round-trip South America from Santos From Santos Santos $1004
2025 Feb 16 7 days, round-trip South America from Itajai From Itajai Itajai $957
2025 Feb 19 7 days, round-trip South America from Buenos Aires From Buenos Aires Buenos Aires $1165
2025 Feb 22 7 days, round-trip South America from Santos From Santos Santos $1004
2025 Feb 23 7 days, round-trip South America from Itajai From Itajai Itajai $957
2025 Feb 26 7 days, round-trip South America from Buenos Aires From Buenos Aires Buenos Aires $1105
2025 Mar 01 7 days, round-trip South America from Santos From Santos Santos $1024
2025 Mar 02 7 days, round-trip South America from Itajai From Itajai Itajai $977
2025 Mar 05 7 days, round-trip South America from Buenos Aires From Buenos Aires Buenos Aires $1105
2025 Mar 08 7 days, round-trip South America from Santos From Santos Santos $994
2025 Mar 09 7 days, round-trip South America from Itajai From Itajai Itajai $947
2025 Mar 12 7 days, round-trip South America from Buenos Aires From Buenos Aires Buenos Aires $1105
2025 Mar 15 7 days, round-trip South America from Santos From Santos Santos $974
2025 Mar 16 7 days, round-trip South America from Itajai From Itajai Itajai $927
2025 Mar 19 7 days, round-trip South America from Buenos Aires From Buenos Aires Buenos Aires $1105
2025 Mar 22 7 days, round-trip South America from Santos From Santos Santos $974
2025 Mar 23 7 days, round-trip South America from Itajai From Itajai Itajai $927
2025 Mar 26 7 days, round-trip South America from Buenos Aires From Buenos Aires Buenos Aires $1105
2025 Mar 29 7 days, round-trip South America from Santos From Santos Santos $974
2025 Mar 30 7 days, round-trip South America from Itajai From Itajai Itajai $927
2025 Apr 20 22 days, one-way from Santos to Southampton Santos $1966
2025 Apr 20 23 days, one-way from Santos to Rotterdam Santos $2036
2025 Apr 20 26 days, one-way from Santos to Kiel Santos $2226
2025 Apr 20 27 days, one-way from Santos to Copenhagen Santos $2303
2025 Apr 21 22 days, one-way from Rio de Janeiro to Rotterdam Rio de Janeiro $1921
2025 Apr 21 25 days, one-way from Rio de Janeiro to Kiel Rio de Janeiro $2111
2025 Apr 23 20 days, one-way from Salvador de Bahia to Rotterdam Salvador de Bahia $1719
2025 Apr 23 23 days, one-way from Salvador de Bahia to Kiel Salvador de Bahia $1949
2025 Apr 24 19 days, one-way from Maceio to Rotterdam Maceio $1630
2025 Apr 24 22 days, one-way from Maceio to Kiel Maceio $1860
2025 May 12 4 days, one-way from Southampton to Kiel Southampton $409
2025 May 13 3 days, one-way from Rotterdam to Kiel Rotterdam $329
2025 May 16 7 days, round-trip Northern Europe from Kiel From Kiel Kiel $1141
2025 May 17 7 days, round-trip Northern Europe from Copenhagen From Copenhagen Copenhagen $1169
2025 May 23 7 days, round-trip Northern Europe from Kiel From Kiel Kiel $1141
2025 May 24 7 days, round-trip Northern Europe from Copenhagen From Copenhagen Copenhagen $1169
2025 May 30 7 days, round-trip Northern Europe from Kiel From Kiel Kiel $1142
2025 May 31 7 days, round-trip Northern Europe from Copenhagen From Copenhagen Copenhagen $1171
2025 Jun 06 7 days, round-trip Northern Europe from Kiel From Kiel Kiel $1142
2025 Jun 07 7 days, round-trip Northern Europe from Copenhagen From Copenhagen Copenhagen $1171
2025 Jun 13 7 days, round-trip Northern Europe from Kiel From Kiel Kiel $1142
2025 Jun 14 7 days, round-trip Northern Europe from Copenhagen From Copenhagen Copenhagen $1171
2025 Jun 20 7 days, round-trip Northern Europe from Kiel From Kiel Kiel $1252
2025 Jun 21 7 days, round-trip Northern Europe from Copenhagen From Copenhagen Copenhagen $1281
2025 Jun 27 7 days, round-trip Northern Europe from Kiel From Kiel Kiel $1242
2025 Jun 28 7 days, round-trip Northern Europe from Copenhagen From Copenhagen Copenhagen $1271
2025 Jul 04 7 days, round-trip Northern Europe from Kiel From Kiel Kiel $1242
2025 Jul 05 7 days, round-trip Northern Europe from Copenhagen From Copenhagen Copenhagen $1271
2025 Jul 11 7 days, round-trip Northern Europe from Kiel From Kiel Kiel $1252
2025 Jul 18 7 days, round-trip Northern Europe from Kiel From Kiel Kiel $1242
2025 Jul 19 7 days, round-trip Northern Europe from Copenhagen From Copenhagen Copenhagen $1271
2025 Jul 25 7 days, round-trip Northern Europe from Kiel From Kiel Kiel $1512
2025 Jul 26 7 days, round-trip Northern Europe from Copenhagen From Copenhagen Copenhagen $1541
2025 Aug 01 7 days, round-trip Northern Europe from Kiel From Kiel Kiel $1512
2025 Aug 02 7 days, round-trip Northern Europe from Copenhagen From Copenhagen Copenhagen $1541
2025 Aug 08 7 days, round-trip Northern Europe from Kiel From Kiel Kiel $1532
2025 Aug 09 7 days, round-trip Northern Europe from Copenhagen From Copenhagen Copenhagen $1561
2025 Aug 15 7 days, round-trip Northern Europe from Kiel From Kiel Kiel $1512
2025 Aug 16 7 days, round-trip Northern Europe from Copenhagen From Copenhagen Copenhagen $1541
2025 Aug 22 7 days, round-trip Northern Europe from Kiel From Kiel Kiel $1242
2025 Aug 23 7 days, round-trip Northern Europe from Copenhagen From Copenhagen Copenhagen $1271
2025 Aug 29 7 days, round-trip Northern Europe from Kiel From Kiel Kiel $1242
2025 Aug 30 7 days, round-trip Northern Europe from Copenhagen From Copenhagen Copenhagen $1271
2025 Sep 05 7 days, round-trip Northern Europe from Kiel From Kiel Kiel $1241
2025 Sep 06 7 days, round-trip Northern Europe from Copenhagen From Copenhagen Copenhagen $1269
2025 Sep 12 12 days, one-way from Kiel to Savona Kiel $1464
2025 Sep 12 11 days, one-way from Kiel to Marseille Kiel $1374
2025 Sep 12 10 days, one-way from Kiel to Barcelona Kiel $1271
2025 Sep 13 11 days, one-way from Copenhagen to Savona Copenhagen $1386
2025 Sep 13 10 days, one-way from Copenhagen to Marseille Copenhagen $1296
2025 Sep 23 4 days, round-trip Mediterranean from Marseilles From Marseilles Marseille $558
2025 Sep 24 4 days, round-trip Mediterranean from Savona From Savona Savona $556
2025 Sep 24 2 days, one-way from Savona to Barcelona Savona $322
2025 Sep 26 3 days, round-trip Mediterranean from Barcelona From Barcelona Barcelona $428
2025 Sep 27 10 days, round-trip Mediterranean from Marseilles From Marseilles Marseille $1419
2025 Sep 28 10 days, round-trip Mediterranean from Savona From Savona Savona $1447
2025 Sep 29 10 days, round-trip Mediterranean from Barcelona From Barcelona Barcelona $1409
2025 Oct 07 10 days, round-trip Mediterranean from Marseilles From Marseilles Marseille $1474
2025 Oct 08 10 days, round-trip Mediterranean from Savona From Savona Savona $1502
2025 Oct 09 10 days, round-trip Mediterranean from Barcelona From Barcelona Barcelona $1464
2025 Oct 17 10 days, round-trip Mediterranean from Marseilles From Marseilles Marseille $1339
2025 Oct 18 10 days, round-trip Mediterranean from Savona From Savona Savona $1387
2025 Oct 19 10 days, round-trip Mediterranean from Barcelona From Barcelona Barcelona $1329
2025 Oct 27 11 days, round-trip Mediterranean from Marseilles From Marseilles Marseille $1329
2025 Oct 28 11 days, round-trip Mediterranean from Savona From Savona Savona $1356

Costa Diadema Review

Review of Costa Diadema

The 2014-built Costa Diadema cruise ship is of the Dream-class Costa liners, the flagship (replacing Costa Fascinosa) and the newest of Costa Cruises vessels. Diadema means “tiara” in Italian.

The vessel (IMO number 9636888) is currently Italy-flagged (MMSI 247353700) and registered in Genoa.

History - construction and ownership

Costa Cruises is a Genoa-headquartered subsidiary company owned by Carnival Corporation. Costa is Europe's second-largest cruise line (after MSC) with year-round operations in the Mediterranean. Costa was founded in 1854 as a cargo shipping company. It started passenger shipping services in 1947, with regular Transatlantic crossings between Europe (Italy) and South America. In 2000, Costa Cruises was acquired by Carnival Corporation (shipowner).

Costa Diadema cruise ship

The 3800-passenger ship Costa Diadema is designed with many innovations in different areas such as food, entertainment, and technology. When put in service, Costa Diadema became the largest Italian-flagged cruise ship afloat. The shape of the cruise ship is similar to the Carnival's Dream, but is different in several ways: it is larger, with more space on board, with new decor and overall design. Diadema’s refined elegance and exquisite atmosphere will make you feel in comfort and full relax. A wide range of attractions awaits for you to experience endless food selection with flavors from the whole world, and the pampering Samsara Spa for maximum well­being.

Besides the ship's staff and crew, Costa cruise passengers are also served by Peper robots - the latest cyborg technology implemented fleetwide in 2016. These humanoid robots greet and guide passengers upon embarkation. They also assist them throughout the cruise by providing information and tips on onboard dining, entertainment, enrichment program (workshops, pre-scheduled events), casino and shopping promotions, shore excursions and tours. Pepper robots are mobile and communicate in 3 languages (English, German, Italian). They can also interpret human emotions by analyzing voice tones and facial expressions.

Decks and Cabins

Costa Diadema staterooms (1886 total, in 15 grades) include 28x Suites, 905x Balconies (of which 100x “Cove Balcony”), 240x Oceanviews, 666x Inside (of which 17x single), 36x wheelchair-accessible cabins. The total number of Samsara Spa staterooms is 161, of which 11x Suites, 90x Balcony, 40x Interior.

The largest accommodations are the Grand Suites (275-345 ft2 / 26-32 m2, with terraces sized 65-85-275 ft2 / 6-8-26 m2).

The boat has 14 passenger decks, of which 9 are with cabins.

Shipboard dining options - Food and Drinks

Costa Cruises Diadema is ready to sparkle with exclusive innovations in entertainment and technology. Diadema offers seven restaurants, four of which (Samsara Restaurant, the Club Restaurant, Teppanyaki Restaurant, Piazza Pizza Pizzeria) at an additional charge, fifteen bars, including ‘Vinoteca Huit­Huit’, ‘Birreria La Fiamma’, ‘Bar Bollicine’, ‘Gelateria Amarillo’. Scudo Rosso Restaurant is the larger of the two MDRs stretching the entire width of Diadema's Deck 3. For those who want a cooked breakfast of bacon and eggs, Scudo Rosso Restaurant is the only free place to find it. Sissi Restaurant is the second main dinner option. Sissi's golden colors are enhanced with mother-of-pearl details. Panoramic windows allow for ocean views on two sides. Sissi is dinner-only and occasionally opens for lunch on sea days. Costa Diadema also offers complimentary 24-Hour Room-Service.

Costa Diadema cruise ship

Follows the complete list of Costa Diadema restaurants and food bars.

  • Ristorante “Scudo Rosso” (complimentary forward Dining Room, operates with open seating Breakfast and Lunch, 2 assigned seatings for Dinner - at 6:30 pm and 9 pm)
  • Ristorante “Sissi” (complimentary 2-level aft Dining Room with 2 fixed Dinner seatings)
  • Ristorante Club Diadema (specialty a la carte restaurant; Steakhouse menu and extensive wine list; dinner-only, reservations required)
  • Tavola Teppanyaki (Japanese restaurant with Asian cuisine)
  • La Piazza Pizza (24-hour pizzeria, complimentary)
  • Ristorante Samsara (serves healthy and low-calorie food; with complimentary dining room for guests in Samsara Spa cabins, and a specialty restaurant for other passengers at a surcharge/reservations are required)
  • Ristorante Corona Blu (self-service buffet restaurant, complimentary; offers breakfast, lunch, afternoon tea at 4-5 pm, and dinner; in the evening is transformed into Pizzeria, complimentary, with waiter service).

Introduced in 2021, "Destination Dishes" are complimentary and available at the MDR's/main dining rooms fleetwide. They are based on individual recipes designed by a "celebrity chef trio" (Bruno Barbieri/Italian, Helene Darroze/French, Angel Leon/Spanish) and interpret the traditional food of the destinations to be visiting by the ship on the following day of the voyage.

Shipboard entertainment options - Fun and Sport

The unique Samsara Spa ­spreads on four floors at 7800 m2, and features a modern gym, spa, treatment rooms, thalassotherapy pool, sauna, UVA solarium, steam room. An outdoor jogging track, multisports pitch, eight hot tubs and three pools (one is with a retractable roof), and even a baby pool are also available on board – and not only for keen sportsmen, of course. As for entertainment, a lot can be said. The 4D Cinema, 3-storey theatre, disco, and country-rock club offer something for everyone. Try your luck at least once at the casino, or join the kids in the 2-­storey games area and the Grand Prix Simulator.

Costa Diadema cruise ship

Follows the complete list of Costa Diadema lounges, clubs and other entertainment venues for kids, teens, and adults.

  • Teatro Emerald (3-tiered theatre and main show lounge; hosts grand scale show productions, musicals, classical concerts, ballet performances, circus, and laser light shows)
  • 4D cinema room (featuring 3D films with moving seats)
  • Grand Bar Orlov (with own dance floor and stage for live performances; hosts quiz games and fashion reviews)
  • Country Rock Club (nightclub bar for classic rock music)
  • Cigar Lounge and Bar (also selling cigars and fine liquor)
  • Bar Bollicine (Prosecco bar serving wines and champagne)
  • Sala Carte (cards room)
  • Casino Golden Jubilee (served by bar Golden Jubilee)
  • Diadema Atrium (multi-deck “Atrio Eliodoro” - an open-floor area with live music and entertainment, served by Eliodoro Lobby Bar)
  • Atrio Sissi (2-level, aft location smaller Atrium)
  • Sala Desiree and Sala Tiara (lounge bars)
  • “Principe Nero” (“The Black Prince” piano bar)
  • Salone “La Buena” (grand lounge with La Buena Bar)
  • Discoteca Opernball (2-level Disco Nightclub, DJ program nightly; served by Opernball Bar)
  • Biblioteca Gubelin and Internet Point (Library/computers room)
  • Portobello Market Piazza and Galleria Shops (duty and tax-free shops for brand watches, jewelry, perfumes, fashion clothes, Costa-logo merchandise, sportswear, gifts, tobacco, and liquor)
  • Birreria “La Fiamma” (brewery/beerhouse with English pub menu); Vinoteca “Huit-Huit” (wines bar)
  • Gelateria Amarillo (ice-cream parlor)
  • Bar Stella del Sud and Balconata (with 2 cantilevered Whirlpools)
  • Area Foto (Photo Gallery and Shop)
  • Scuderia Costa (themed bar Formula 1 with Grand Prix simulator)
  • Mondo Virtuale (Video Games Arcade)
  • Cappella (Wedding Chapel, also used for religious services)
  • Squok Club (kids lounge with Mini Club (3-6 yo) and Maxi Club (7-11 yo) playing rooms; with complimentary kids program and supervised activities; complimentary babysitting)
  • Teen Zone (teenagers' lounge with Teen Junior (12-14 yo) and Teen Club (15-17 yo) rooms; complimentary supervised activities, themed parties, sports contests)
  • Centro Benessere Samsara (3-level Spa and Wellness complex, with Fitness and separate Spinning/Aerobics Room; Venus Beauty Salon, Massages and Treatments Rooms, Japanese TeaRoom, Relaxation Room, Thermal Suites, Solarium, Tepidarium (heated loungers), Laconium (low humidity sauna), Aroma Steam Baths, Thalassotherapy pool, Turkish Bath, Solarium, Saunas, Kinesis Room. All Diadema’s guests in Samsara Spa staterooms have free access to most of the Spa complex)
  • Lido Diana pool area (lido pool with two Whirlpools, huge LED screen, PlayStation nights; served by two Bars)
  • Lido Stella del Sud pool area (with two Whirlpools, served by two Bars)
  • Lido Squok (kids’ mini Aquapark)
  • Winter Garden (glass-roofed bar lounge; live plants, live music)
  • Balconata Belle Etoile (outdoor movie screen)
  • Solarium (open-air relaxation area)
  • Campo da Gioco (combined court for tennis and basketball); Pista da Jogging (Power Walking/Jogging Track), doubled with a Roller Skating Track; Putting Green Area; Virtual Golf Game.

Itineraries

Costa Diadema itinerary program is based on European voyages (mainly in the Western Mediterranean). Seasonally, Diadema is deployed in the Caribbean for roundtrips from Guadeloupe (Pointe-a-Pitre on Grande-Terre Island) as well as Transatlantic crossings (RepositionCruises.com) between Europe and the Caribbean.

In September 2022 was canceled Costa Diadema's winter schedule (Nov 18, 2022, thru March 28, 2023/137x total departures) that included 14-day Canary Islands voyages leaving roundtrip from homeports in Italy (Savona), Spain (Valencia, Barcelona) and France (Marseilles). The boat restarted operations on April 7, 2023, out of Barcelona.

Photos of Costa Diadema

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Costa Diadema ship related cruise news

Costa Diadema Wiki

Diadema is among Costa's largest liners. Following the inaugural cruise/maiden voyage (November 10, 2014, Venice to Savona), it became the largest Italy-flagged vessel. and replaced Costa Fascinosa as flagship. From the same DREAM-class (sisterships) are the "Carnival Fun Ships" Carnival BreezeCarnival DreamCarnival Magic.

At the time, Diadema was Costa's largest shipbuilding order - placed on August 3, 2011.

The vessel's physical construction/assembly at Marghera Shipyard (Venice Italy) started on December 10, 2012, with the keel-laying ceremony.

The vessel was launched/floated out from drydock on November 16, 2013, officially delivered to Costa on October 25th, 2014, and christened on November 7th in Venice. The inaugural cruise left Venice on November 8th. The 7-day Western Mediterranean itinerary visited port cities in Italy (Naples, La Spezia, Savona), Spain (Barcelona, Palma de Mallorca) and France (Marseille).

Diadema was the first-ever cruise ship to debut a laser maze show. All guests of the event were allowed to race through it. In 2016, on Diadema was tested Costa's 4GOODFOOD program for decreasing food waste on cruises. The results were ~50% reduction in food waste, and up to 20% lower food consumption at the onboard self-service buffet restaurants.

In 2017, the Diadema became the fleet's first vessel on which was introduced the onboard-made, certified mozzarella produced from buffalo milk. The new product (branded "Latteria del Curatino") was created via a partnership with two Campania-based dairy companies - "Comat" (dairy equipment manufacturer) and "Podere dei Leoni" (creamery, a leading Italian producer of certified buffalo mozzarella). With Diadema, Costa became the world's first cruise company to serve fresh-made mozzarella on board.

Costa Diadema's last drydock refurbishment was in 2023 (November 5-19) conducted at Chantier Naval de Marseille (France). The project included general maintenance works, classification inspections and technical overhauls, as well as renovations and upgrades to all public areas, venues and passenger staterooms, including new carpeting and soft furniture.