Oval Diamond offers outstanding brilliance, durability, and style. Shiv Shambhu has a large collection and recommends H, I, J, and K colors or better and VVS2, VS1, VS2, Si1, and Si2 for clarity for oval cut diamonds. Oval diamonds in your engagement ring are a beautiful way to start a new look. The most common and classic shape is the oval, it is the most visible stone and allows more light to enter the diamond, increasing the stone's luster.