Costa Diadema — Deck Plans, Live Tracker, Dining & Videos

Costa Diadema is a Diadema Class cruise ship operated by Costa Cruises. She entered service in 2014, measures 132,500 gross tons, and carries approximately 4,947 guests at double occupancy with a crew of 1,253.

Quick Answer: Costa Diadema is the only Diadema Class ship — 132,500 GT, 4,947 guests, launched in 2014. She was Costa's largest ship before the Excellence Class and features an extensive outdoor promenade deck. This page covers deck plans, live tracking, dining venues, and videos.

Who She's For: Travelers who want a large Costa ship with a standout outdoor promenade and Italian-forward atmosphere. Costa Diadema suits European cruisers who enjoy sea-view walking, outdoor dining, and Mediterranean itineraries at a value price.

Costa Diadema is unique in the fleet as the sole Diadema Class ship, sitting between the Concordia Class (114,000 GT) and Vista Class (135,000 GT) in size. Her signature feature is the wrap-around outdoor promenade lined with bars and restaurants — unusual for a ship of this era. The atmosphere is Italian-forward with multilingual service. If you want Costa's newest and largest ships, the Excellence Class (Smeralda, Toscana) are the flagships at 185,010 GT.