A 1-carat diamond weighs 200 milligrams and is a popular choice for engagement rings and fine jewelry. The carat weight is a measure of the diamond's size, but it does not solely determine its value. Other factors, such as cut, color, and clarity, also play significant roles in assessing a diamond's quality and price. In the diamond industry, the Gemological Institute of America (GIA) is a leading authority that grades diamonds based on these criteria. A well-cut 1-carat diamond can appear larger than a poorly cut one, making the cut an essential aspect of its overall appearance and brilliance.