Shop our selection of Asscher Cut, E Color diamonds to build a custom engagement ring. Learn the proportions and symmetry behind your stone's cut grade, in its AGSL or GIA certification and grading report. Once you've chosen the loose stone that's perfect for you, you can continue building your engagement ring with one of our ring settings in a variety of metal types, including platinum and rose gold. If you desire help along the way, contact our free, non-commissioned virtual gemologist service or our expert customer service team for expert advice. With Ritani's free in-store preview program, you can view your diamond or custom wedding ring obligation-free at any of our authorized local jewelers in the US.