Shop our broad selection of Round Cut, 1.5 Carat diamonds and build the perfect ring today. All of Ritani's high quality loose diamonds are analyzed by the GIA or AGSL, complete with a detailed grading and certification report. After you've chosen the perfect one, browse our large inventory of ring setting options, such as the vintage halo engagement ring or the ageless solitaire setting. For expert advice while your shopping, you can question our gemologist or helpful customer service team. We have partnered with local jewelry stores across the US so that you can see your loose diamond or designer jewelry in person and try before you buy.