Are these stones worth investing? Which is the best?

Hi all, I am finding a diamond for engagement ring, would like to find one with the best quality possible (under the budget) and keep it for life. Are these 3 good quality? Wich one would you choose if so? Struggling to choose and need some professional opinion.



If you were just to choose 1 stone which one would you choose? Or none of them? I really cannot decide... Please help comment. Many thanks!!