Shop our selection of Round Cut, 1.4 Carat, Si1 diamonds to build a one-of-a-kind engagement ring. All of our products come with their own detailed grading and certification reports from the AGSL or GIA. 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. Contact our customer service team or try our non-commissioned virtual gemologist service if you need any assistance as you're choosing your diamond. Preview your diamond, custom wedding ring, or engagement ring at Ritani's local jeweler partners, situated across the United States.