Aboard the two highest-rated ships in the world, Crystal Symphony and Crystal Serenity, you will discover the hallmarks of Crystal... extraordinary service, abundant space, exceptional quality and incredible choices. This is the very essence of our company; this is the Crystal Difference. A steadfast commitment to excellence has earned us unprecedented recognition as the World’s Best for an incredible 17 years – an accomplishment unmatched by any other cruise line, hotel or resort anywhere in the world.