Radiant Cut Lab Grown Diamonds Shop loose radiant cut lab grown diamonds at Luvia Designs. Radiant cut diamonds combine the elegance of an emerald cut outline with the brilliance of a round cut, featuring trimmed corners and exceptional sparkle. Our IGI-certified radiant lab grown diamonds offer outstanding light performance at remarkable value. Browse our collection of loose radiant cut lab grown diamonds in a range of carat weights, colors, and clarity grades — perfect for bold engagement rings and custom settings.