This is a Genuine 2 CT Carbonado Black Round Cut Diamond Ring 925 Sterling Silver. No Chemical or Color added. High Pressure High Temp treated. Diamonds are subjected to high temp. & high pressure in machines to enhance color. This process moves the atoms in the Diamond. Due to the nature of it's composition it may test as Moissanite. See slides, part of item description. Please ask all questions before purchasing. It will Sparkle Forever!!!