A 10 carat diamond ring is a rare and exceptional piece of jewelry that can cost well into the hundreds of thousands. The price varies depending on the quality of the diamond and whether it’s lab or natural, and the design of the ring, but generally speaking, a 10 carat diamond can cost upwards of $200,000 or more. Factors that can impact the price include the cut, clarity, color, and carat weight of the diamond, as well as the type of metal used for the band and any additional features like side stones.