DDE Ass #11 Key Terms & Concepts PDF

DDE Ass #11 Key Terms & Concepts: Characteristic Color—The basic face-up color of a colored diamond. Depth of Color—The combination of tone and saturation. Hue—The first impression of an object’s basic color. Master-Eye Effect—The optical illusion that causes the ungraded diamond to app...

DDE Ass #11 Key Terms & Concepts: Characteristic Color—The basic face-up color of a colored diamond. Depth of Color—The combination of tone and saturation. Hue—The first impression of an object’s basic color. Master-Eye Effect—The optical illusion that causes the ungraded diamond to appear either lighter or darker than the masterstone, depending on which side it’s on. Masterstones—A set of color-comparison diamonds that defines GIA diamond color grades in the normal (D-to-Z) range. Saturation—The strength or intensity of a color. Tone—The degree of darkness or lightness of a color. Key Concepts: Slight color differences can equal large value differences. The three elements used to describe color are hue, tone, and saturation. When saturation drops, cool and warm hues become grayish and brownish, respectively. Many colors that are called grays are in fact very low saturations of various hues. The GIA diamond color grading system is the universal standard in the jewelry industry. Each letter on the scale represents a narrow range of color, and each masterstone marks the least amount of color in that range. The biggest price difference occurs between the D and E grades, all other factors being equal. The GIA color grading system helps diamond professionals communicate accurately about diamond color. The color grading environment should influence the color grade as little as possible. The most widely accepted lighting for color grading diamonds is balanced, daylight-equivalent fluorescent light. The set of masterstones should be matched to the specific color grading requirements of the user. The masterstones and the diamond to be graded must be clean for best results. It’s possible to estimate diamond color, and the results can be fairly accurate. Proportion variations, size, and clarity characteristics can influence a diamond’s color appearance. Cut can influence the color of colored diamonds, so they’re graded face-up. The goal of colored diamond color grading is to arrive at a repeatable, consistent grade.