Shop our vast selection of Cushion Cut, 3 Carat diamonds and build the perfect ring today. All Ritani products are ethically sourced and come with a certification report from the established diamond agencies GIA or AGSL. Once you've selected your perfect stone, choose from a diverse range of engagement ring styles, including elegant solitaire and vintage halo ring settings. Our superb customer service team and free gemologist service will lend any assistance or advice you need during the selection process. Ritani partners with local jewelers all over the United States so you can preview your diamond ring in-person, for free.