Editor's Note: This is a SINGLE stud earring. If you'd prefer a set, please be sure to purchase two!Classic Moissanite™ is the world's most brilliant gem®. Inspired by the beauty and fire of natural moissanite, discovered over a century ago in an ancient meteorite by Dr. Henri Moissan, Charles & Colvard® patented an ethical process for growing gem-quality Moissanite. More brilliant than a diamond at a fraction of the cost, more durable than a sapphire, ruby, or emerald, nothing compares to or outshines Charles & Colvard Created Moissanite®.Classic Moissanite™ created by Charles & Colvard® is guaranteed to last forever. Each stone comes with a Certificate of Authenticity and Limited Lifetime Warranty ensuring that it will maintain its brilliance and fire, without ever fading or changing color.CT (carat) TW (total weight) DEW (diamond equvalent weight) represents the approximate total weight of diamonds of similar appearance.