Charles and Colvard 6.5mm Round Moissanite Screw Back 14K White Gold Stud Earrings Pair of 6.5mm Each Round Cut Forever Classic Moissanite Stones (1.76CTW Actual Weight, 2.0CTW Diamond Equivalent Weight). Four (4) Prong 14k White Gold Screw Back (Threaded) Round Stud Earrings. Round Faceted Very Good Quality and Cut Charles and Colvard Created Moissanite. With a hardness of 9.5 on the Mohs scale, it is the second hardest natural material known to man. Includes Charles and Colvard Certificate.