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What is Fluorescence?

Fluorescence is not directly related to a diamond's color. This separate characteristic refers to whether or not a stone will produce a color reaction when exposed to long-wave ultraviolet (UV) light (such as the light that comes from black light). A stone that has fluorescence will give off a distinctive glowing blue coloration when exposed to UV light. Under most other lighting conditions, this fluorescence is not detectable to the eye. The fluorescence of a diamond is defined by its intensity as either None, Faint, Medium, Strong, or Very Strong. While some say a fluorescence grade of strong or very strong will cause a diamond to appear oily or murky, others claim with great conviction that it actually enhances the diamond's overall appearance. A study put forth by the Gemological Institute of America (GIA) concluded that fluorescence in diamonds is just a matter of aesthetics and should not be a major concern when selecting a diamond. Below we provide you with our recommendation of colors along with their preferred fluorescent rating.