When exposed to ultraviolet light, a diamond may exhibit a more whitish, yellowish or bluish tint, which may imply that the diamond has a property called fluorescence. Diamond grading reports often state whether a diamond has fluorescent properties. Ratings include: none, faint, slight, medium, strong blue. Strong blue fluorescence may cause the Diamond to appear oily in daylight. Fluorescence is not considered a grading factor, only a characteristic of that particular diamond.
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