Diamond Fluorescence refers to the tendency of diamonds to emit a soft-colored glow when they are exposed to UV rays from Sun or fluorescent lamps. According to GIA (Gemological Institute of America), only 25 to 35 percent of the diamonds may exhibit this characteristic.
For diamond buyers here it is important to understand that fluorescing is an identifying characteristic and not a grading factor like the GIA 4Cs (clarity, cut, carat weight and color). This means that it should not be considered as a major factor when buying diamonds since its effects are negligible.
However, if you do want to keep diamond fluorescence in consideration when making a purchase, then it is advisable to opt for diamonds with I to M color grades as it is believed by trade professionals that blue fluorescence tends to enhance the diamond’s appearance as it makes a faint yellow diamond look colorless in UV lighting. Therefore, near colorless to yellowish diamonds that have strong or medium fluorescence are likely to sell slightly higher/carat price. Likewise, diamonds with very strong fluorescence sell at 5 percent less than a diamond that has no fluorescence.
For more information on fluorescing diamonds, call us at 212-221-1095