The word "stunner" is usually used to describe someone or something that is extremely attractive, impressive, or surprising in a positive way. Full definition
«This absolute stunner of a salad is a piece of art of a plate and absolutely explodes with gorgeous layers of sweet, sharp and zingy flavours. (meatfreemondays.com)
The iPhone 6 was the real stunner in this category. (tomsguide.com)
This year Zeniya came as an absolute stunner with bright, exotic cuts and graceful styles to make your look chic and sophisticated. (galstyles.com)