Real beauty comes from the kind of person you are, the choices you make and how you treat other people. The lesson, I think, is that we should all put our best face forward. Beauty is certainly not as important as character. Beauty can be inherited, but character is forged.
such a beauty” is a correct, usable phrase in written English. You can use it to describe something wonderful or remarkable, often in a romantic or poetic way. For example: “The sunset was such a beauty, it took my breath away.”.