Rocks Forever Collection of Laboratory Engagment Rings - Ria 18ct White Gold Ring with a Round Brilliant Cut Laboratory Grown Diamond Surrounded by a Diamond Halo. A stunning ring with a dazzling display of diamonds, the diamond halo and the diamond set shoulders all add to the sparkle and create the most beautiful ring. The overall spread of diamonds creates the illusion of a much larger centre diamond. Laboratory Grown Certified Diamond Centre Diamond Carat Weight: 0.66ct Total Diamond Carat Weight: 1.01ct