Diamond Certification is a process that evaluates and grades diamonds based on specific criteria, known as the Four Cs: cut, color, clarity, and carat weight. This certification is typically provided by reputable gemological laboratories, ensuring that the diamond's quality is accurately assessed and documented. A certified diamond comes with a grading report that details its characteristics, helping buyers make informed decisions. This report serves as a guarantee of the diamond's authenticity and quality, providing confidence in the purchase. Well-known certification organizations include the Gemological Institute of America (GIA) and the American Gem Society (AGS).