Laboratory Diamond Jewellery › 1.75Ct Oval Lab Diamond Ring - IGI Certified - SQ1420590 Image 1 of 1 1.75Ct Oval Lab Diamond Ring - IGI Certified - SQ1420590 $5,225.00 18Kt Yellow Gold Oval Lab Diamond Ring. Set with a 1.75Ct Lab Diamond of E Colour SI1 Clarity. IGI Certificate #LG533219670 Add To Cart Added! 18Kt Yellow Gold Oval Lab Diamond Ring. Set with a 1.75Ct Lab Diamond of E Colour SI1 Clarity. IGI Certificate #LG533219670