6.5 mm Cubic Zirconia Hearts and Arrows Ideal Cut Round Stud Earrings in 10K White Gold Cubic zirconia is a synthesized material, very hard, flawless and mostly colorless, but is also made in a variety of different colors. The studs have round AA quality Cubic zirconias. Matching pendant available. 30 Day No questions asked Return Policy Free-Shipping within US April Birthstone / Anniversary Gift