What makes these the best one-carat diamond rings? First, we use artificial intelligence to sort through the thousands and thousands of gems available on the market today to recommend the most brilliant one-carat diamonds, balancing both quality and value. Each one is guaranteed to sparkle and responsibly sourced, with its quality independently confirmed by a GIA grading report. You can customize the details of our beautiful setting styles or commission a completely custom one-carat diamond ring design. Our skilled craftsmen will then create your engagement ring to order in our Los Angeles studio from your choice of recycled precious metals. Your one-carat diamond ring will be made from scratch just for you.