How our Bliss Filters work
Detailed side-by-side comparison of Costa Cruises and Royal Caribbean cruise ships
| Specification | Costa Diadema | Radiance of the Seas |
|---|---|---|
| Cruise Line | Costa Cruises | Royal Caribbean |
| Maiden Voyage | 2012 | 2001 |
| Year Refurbished | N/A | 2015 |
| Adults Only | No | No |
| Specification | Costa Diadema | Radiance of the Seas |
|---|---|---|
| Passenger Capacity | 4,947 | 2,139 |
| Crew Size | 1,253 | 869 |
| Guest-to-Crew Ratio | 3.95 | 2.46 |
| Specification | Costa Diadema | Radiance of the Seas |
|---|---|---|
| Gross Tonnage | 132,500 | 90,090 |
| Length | 1,004 ft | 962 ft |
| Width | 122 ft | 131 ft |
| Ship Size Category | Mega | Large |
| Number of Decks | 20 | 12 |
| Specification | Costa Diadema | Radiance of the Seas |
|---|---|---|
| Overall Cruiseable Rating | 8.0 / 10 | 7.0 / 10 |
| Roominess Score | N/A | 35.5 |
| Advised For | Families, entertainment | Staterooms, families, spa and fitness |
