Diamond fluorescence is a form of illumination that is created when a diamond is exposed to Ultraviolet (UV) light. Your diamond can be exposed to Ultraviolet light from the "backlights" often found in nightclubs, the drying lights used in nail salons, fluorescent lights or direct sunlight. Diamonds emit light due to fluorescence when small amounts of the element boron are present in the stone. Blue is the most common color of fluorescence, but other colors (yellow, greenish blue, green, white and pink) are also possible.
Approximately 35 percent of gem quality diamonds have fluorescence when viewed under an ultraviolet light. Roughly, 10 percent of gem quality diamonds have enough fluorescence to make a noticeable difference in the diamonds color when seen under incandescent light (low in UL) and in sunlight or fluorescent light (high in UL). In less than 2 percent of diamonds, the level of fluorescence is high enough too visually cause the diamond to appear foggy or milky in appearance.
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