DDG Ass #10 Key Concepts PDF

DDG Ass #10 Key Terms & Concepts Eye-Visible—Visible to the unaided eye, without magnification. Grade-Setting Characteristics—Inclusions or blemishes that establish the clarity grade of a diamond. Plot—A map of a diamond’s inclusions, blemishes, and facet arrangement. Relief—Contrast...

DDG Ass #10 Key Terms & Concepts Eye-Visible—Visible to the unaided eye, without magnification. Grade-Setting Characteristics—Inclusions or blemishes that establish the clarity grade of a diamond. Plot—A map of a diamond’s inclusions, blemishes, and facet arrangement. Relief—Contrast between an inclusion and its host gem. Key Concepts: The GIA Diamond Grading System provides a universally accepted way to communicate diamond quality. The effect of clarity characteristics on clarity grade is based on their size, number, location, relief, and nature. Large inclusions usually have the greatest influence on the clarity grade. Because no two diamonds are alike, it’s difficult to develop a precise description of any clarity grade except Flawless. Blemishes very rarely have an effect on grades lower than IF. A clarity grade is usually determined by the largest or most visible characteristics. VS, SI, and I stones can have eye-visible inclusions. Accurate clarity grading includes consideration of the size and shape of the diamond in relation to its clarity characteristics.