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. -60% Compare Quick view Add to wishlist 6.03 CT Marquise Cut IGI Certified Lab-Grown Diamond – E Color VS1 Clarity | Excellent Polish & Symmetry Diamonds $3,000.00 Original price was: $3,000.00.$1,200.00Current price is: $1,200.00. Add to cart