Certified Lab Grown Diamond Radiant-Cut Halo Engagement Ring (1-1/4 ct. t.w.) in 14k Yellow Gold Impressive sparkle. Impressive price. Our beautiful engagement ring will leave her speechless, featuring a superb 1.00 carat radiant lab grown diamond alongside .025 cttw round lab grown diamonds stud the slender 14kt yellow gold ring. Our lab-grown diamond jewelry in 14kt gold includes an IGI Laboratory-Grown Diamond Report to verify color, clarity and carat weight.