Shop our expanded selection of Oval Cut, 3 Carat diamonds and build the perfect women's wedding ring today. When you buy from us, you can be guaranteed your diamond was responsibly sourced and certified by either the GIA or AGSL. After you select the stone that's right for you, complete your ring with a style from our diverse selection of ring settings, from classic solitaires to sparkling vintage halos. If you encounter questions as you're shopping for a diamond, try our virtual gemologist for live advice from a non-commissioned expert. We have partnered with local jewelry stores across the US so that you can see your loose diamond or engagement ring in person and try before you buy.