Shop our certified Asscher Cut, 0.9 Carat loose diamonds to design your own custom engagement ring. Asscher Cut, 0.9 Carat diamonds are versatile enough to suit a timeless solitaire engagement ring or a vintage-inspired halo setting. All Ritani stones come with their own certification reports from the GIA or AGSL, complete with measurements, inclusion diagrams, and the details behind every 4C grade. If you come across any questions along the way, our diamond education or free virtual gemologist service can provide the answers. Once you've chosen your stone and built your stunning engagement ring, you can preview it obligation-free at one of our many local jeweler partners.