Rocks Forever Engagement Ring Collection - Cora 18ct Yellow Gold Ring with a Pear Cut Centre Diamond Surrounded by a Halo of Diamonds and Diamond Set Shoulders Centre Diamond Carat Weight: 1.22ct Totla Diamond Carat Weight: 1.62ct Laboratory Grown Certified Diamond A 'lab' grown diamond shares the exact same chemical and physical properties as an earth-mined diamond, just produced in a controlled laboratory setting. Through expert research and development, scientists have found a way to create a diamond in a lab setting by mimicking the exact process and conditions required to form a natural diamond.