Fluorescence, the effect ultraviolet light has on a diamond, is an important consideration when selecting a diamond. Fluorescence in a diamond is caused by a reaction in the trace minerals (boron/nitrogen) within the diamond. When UV light or daylight strikes a diamond with fluorescent properties, the stone emits a glow that is usually blue, but can also reflect shades of green, yellow or white. About one third of all diamonds fluoresce, 95% of these fluoresce blue. Fluorescence can occur in different intensities. Gemological laboratories rate the fluorescence of each diamond on a scale from “None” to “Very Strong”.
Fluorescence has been a great debate in the diamond industry, sometimes affecting the pricing of diamonds. The reason for speculation when it comes to fluorescence is because it can improve a lower colored diamond (J-M) by cancelling out the yellow. However, Fluorescence may have the opposite effect on higher- colored diamonds (D-F). Furthermore, strong fluorescence in a diamond may cause it to look hazy, milky, oily or cloudy causing it to have a lower value. However, most fluorescence is subtle showing only a shift in tone and not color. This can make a diamond ring with multiple stones look out of balance if some stones fluoresce and others do not. If you have selected a stone with “Strong” or “Very Strong” fluorescence, please contact a Popular Diamonds jewelry and diamond expert to have it visually inspected before purchasing.