A diamond certificate is a document that describes the quality features of the diamond in the ring. Diamond certificates are generally issued by the famous grading labs in the country. Grading labs are organizations, which provide diamond grading services to customers and diamond vendors for a certain fee. Some of the most reputable labs in the country are IGI (International Gemological Institute), CIBJO (Confédération International de la Bijouterie, Joaillerie, Orfèvrerie des Diamants, Perles et Pierres; also known as the World Jewelry Confederation), EGL (European Gemological Laboratory), AGS (American Gem Society), and GIA (Gemological Institute of America). The certificates issued by most of these labs contain vital information about the most important characteristics of a diamond such as carat weight, color, clarity, and cut. These vital details will help you to know whether the diamond ring is real or not. However, you need to ensure that your preferred diamond ring is certified by a reputed. If not, it is best to look for other certified diamond solitaire rings.