We use only the highest quality Charles & Colvard Moissanite Stones. The Stones are white in color and catch brilliant fire and light. This is a beautiful set the pictures do not do this set justice. This ring comes with a Charles & Colvardcertification card/authenticity card. ctw (Carat Total Weight): Meaning the combined Weight of all stones we use calibrated weight for equivalent diamond size. The actual weight of a Moissanite is a little less. 11-2.0mm round cut Charles and Colvard Moissanite stones with a total diamond equivalent weight of 1/3 Carat MOISSANITE GEMSTONE: At a fraction of the cost of a diamond, moissanite created by Charles & Colvard is among the hardest minerals on the planet, more durable than sapphire, ruby, or emerald. Its beauty and brilliance is guaranteed to last Forever.