What Does Certified Mean? Certified diamonds are individually graded stones evaluated by IGI or GIA. Most certified diamonds include a laser-inscribed report number on the girdle that matches the grading report. Compare Quick view Add to wishlist 6.03 CT Marquise Cut Lab-Grown Diamond – E Color VS1 Clarity, IGI Certified, Excellent Polish & Symmetry Diamonds $800.00 Add to cart Compare Quick view Add to wishlist 6.04 CT Marquise Cut Lab-Grown Diamond — E Color, VS1 Clarity, IGI Certified Diamonds $800.00 Add to cart