10K White Gold Marquise Tanzanite and Round Diamond Ring, Size 7 The natural properties and composition of mined gemstones define the unique beauty of each piece. The image may show slight differences to the actual stone in color and texture. Gemstones may have been treated to improve their appearance or durability and may require special care. Imported Diamond stone shape is round. Tanzanite stone shape is marquise All our diamond suppliers confirm that they comply with the Kimberley Process to ensure that their diamonds are conflict free.