14k Yellow Gold Simulated Birthstone and Cubic Zirconia Heart Shape Halo Stud Earrings These earrings are made of solid 14k gold, featuring high quality simulated birthstone and cubic zirconia stones. Our cubic zirconia is bright and clear with an unmatched sparkle, so it will easily convince others it's the real thing. Earrings measures 7mm (0.28 in) x 7mm (0.28 in). Weight: 0.85 grams. Total carat weight: 1.00 ct.