Species - carbonado - earth mined. Length of necklace - 18 inches.Clasp - 925 sterling silver. We sell only genuine diamond. Some may be heated which is a common and acceptable treatment, or be fissure filled or color enhanced. We do not sell synthetic or lab created items and assure all diamond are genuine. Our goal is quality service, integrity and complete customer satisfaction. The item should be unused and in original and undamaged condition. This item is made of diamond and silver.