Shop our certified Round Cut, Reserve Ideal loose diamonds to design your own extraordinary engagement ring. Once you find the best stone for you, choose from one of our handmade ring settings and metal choices, including platinum and rose gold. Each of our diamonds is graded and certified by a reputable third-party agency, such as the GIA or AGSL. Contact our free, non-commissioned virtual gemologist service or our expert customer service team if you run into any issues or questions along the way. With Ritani's free in-store preview program, you can try your diamond or wedding ring before you buy it at our local jewelry store partners.