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What Is Diamond Fluorescence, and Why Is It Important to Know?

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It is the visible light (or glow) that some diamonds emit when exposed to ultraviolet (UV) light that is known as fluorescence. The presence of visible fluorescence can be found in approximately one-third of diamonds. When compared to other diamonds, these diamonds are often a better value. Fluorescent diamonds have a number of characteristics that should be considered:

  1. The diamond's color grade is indicated by the color grade. The value of top color stones may be reduced if they have a lot of fluorescence (D-F). In rare cases, if the fluorescence is extremely strong, it can cause a stone to appear milky or hazy, depending on the situation. Blue fluorescence, on the other hand, has the potential to increase the value of lower color diamonds (I and below) by reducing the appearance of yellow tones in a diamond.
  2. The fluorescence has a specific color. More than 95% of fluorescent diamonds emit blue light when illuminated. Yellow, red, green, and white are among the other fluorescence colors available. Yellow or green fluorescence can make a diamond appear even warmer or more intense in color, whereas blue fluorescence can help mask warm tones in a diamond; however, blue fluorescence can make a diamond appear even warmer or more intense in color. Diamonds with yellow or green fluorescence will typically be less expensive than diamonds with blue fluorescence, according to industry standards.
  3. Fluorescence intensity is measured in lux. It's likely that you won't notice that a diamond has faint to medium fluorescence in most lighting environments if it has faint to medium fluorescence. When exposed to sunlight, which contains ultraviolet rays, diamonds with strong to very strong fluorescence may appear milky in appearance. The fluorescence of a diamond will be noted in the GIA grading report at various levels of intensity. The only surefire way to determine how fluorescence appears in a diamond is to examine the diamond in person under a variety of lighting conditions.

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