These Diamonds are Cubic Zirconia 6-A they are cut with precision and is the highest quality Cubic Zirconia Diamond in the world, no other type of Diamond CZ can match the standard created by this Cubic Zirconia Diamond 6-A. Cubic Zirconia is cut in the same shapes and styles as diamonds and they are considered among the best substitute for diamonds. Naked eye cannot differentiate between the Cubic Zirconia Diamond 6-A and the real diamonds. Earrings have 925 sterling silver hooks and each purchase comes with your own sterling silver cloth. First 50 purchases will receive a free Ballerina Lady as shown in picture below