Together, they’re called clarity characteristics. Diamonds have internal features, called inclusions, and surface irregularities, called blemishes. This is as true of diamonds as anything else. Clarityįew things in nature are absolutely perfect. If the fluorescence is too strong it can make the stone look cloudy or “oily,” which can lower the value of the diamond. Blue and yellow are color opposites and tend to cancel each other out, so blue fluorescence masks the yellow color. Strong blue fluorescence can make a light yellow diamond look closer to colorless in sunlight. In rare instances, fluorescence can be white, yellow, orange, or many other colors. Under the right conditions, you can see fluorescence in about 35 percent of gem diamonds.īlue is the most common fluorescent color in gem-quality diamonds. Although invisible to the human eye, UV radiation is everywhere. Many diamonds emit a visible light called fluorescence when they’re exposed to ultraviolet (UV) radiation. Each letter represents a range of color based on a diamond’s tone and saturation. The GIA D-to-Z scale is the industry standard for color-grading diamonds. Even the slightest hint of color can make a dramatic difference in value. Two diamonds of the same clarity, weight, and cut can differ in value based on color alone. Subtle differences in color can dramatically affect diamond value. Three of them-color, clarity, and carat weight-were the basis for the first diamond grading system established in India over 2,000 years ago. Today, the descriptions of each of the 4Cs are more precise than those applied to almost any other consumer product. The terms that people use to discuss the 4Cs have become part of an international language that jewelry professionals can use to describe and evaluate individual diamonds. The 4Cs describe the individual qualities of a diamond, and the value of an individual diamond is based on these qualities. The same relationship between rarity and value exists for clarity, cut, and carat weight. Value and rarity are related: In this case a colorless diamond is more rare and more valuable than one with a slight yellow color. So a colorless diamond rates higher on the color grading scale than a diamond that is light yellow. Colorless diamonds are scarce-most diamonds have tints of yellow or brown. The value of a finished diamond is based on this combination.Ī diamond’s value is often affected by the rarity of one or more of the 4Cs. When used together, they describe the quality of a finished diamond. Comprehensive CAD/CAM For Jewelry Certificateĭiamonds can be fashioned into a variety of shapes and still be beautiful.
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