, I’ve saw someone who is really beauty, This is incorrect. I saw someone who is really beautiful (or, who is a real beauty). You can say that this person is breathtakingly beautiful. Or, that their beauty takes you breath away.

A beauty that makes you -go crazy -drool -feel weak/amazing/strange/incredible

A beauty that would make you (or going to make you) 1- out of words. 2- amazed. 3- speechless. And many other words...