Princess Cut Lab Grown Diamonds Shop loose princess cut lab grown diamonds at Luvia Designs. The princess cut is the most popular fancy shape diamond, featuring a square silhouette with brilliant-cut faceting for maximum sparkle. Our IGI-certified princess lab grown diamonds offer stunning light performance at exceptional value. Browse our collection of loose princess cut lab grown diamonds in a range of carat weights, colors, and clarity grades — perfect for solitaire and custom engagement ring settings