Use our diamond education to learn about Princess Cut, 3 Carat loose diamonds and build the perfect custom ring she'll marvel at forever. 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 four prong solitaire and split shank halo ring settings. For expert advice during your shopping, you can consult our gemologist or stellar customer service team. When you've chosen a loose stone or wedding ring, you can select to preview it in-person, for free, at one of our US based, local partner jewelers, from San Diego, CA to New York City.