2.5ct Cushion Cut Lab Grown Engagement Ring with Pave Band and UnderhaloLab grown cushion cut diamonds are a great choice for an engagement ring. Traditionally these diamonds looked small due to their bottom heavy cut but with lab grown diamonds you can easily choose a larger diamond without much additional cost, like this 2. 5ct square cushion. Cushion cut diamonds combine the softness of a round diamond with the symmetry and clean lines of a princess or emerald cut. They especially look good in a delicate setting like