![]() Bluish fluorescence can make a faint yellowish diamond appear more colorless in UV light, which is part of natural daylight. Some trade professionals think blue fluorescence enhances a diamond’s appearance, especially in diamonds with I to M color grades. Photo: (Top) Maha Tannous/ GIA, (Bottom) Harold & Erica Van Pelt Does diamond fluorescence make a yellow diamond look “whiter”? If the fluorescence is Medium, Strong, or Very Strong, the color of the fluorescence will be noted. GIA Diamond Grading Reports and Diamond Dossiers describe a diamond’s fluorescence by its intensity under long-wave UV light (None, Faint, Medium, Strong and Very Strong). ![]() Is there a diamond fluorescence grade?įluorescence is not a grading factor like the GIA 4Cs ( color, clarity, cut, and carat weight), but it is an identifying characteristic. A rare few fluoresce other colors such as yellow or green. More than 95% of these diamonds fluoresce blue. Only about 25% to 35% of diamonds exhibit some degree of fluorescence in reaction to long-wave UV light. Once the UV light source is removed, the diamond stops fluorescing. This can cause them to emit a bluish light or more rarely, a yellow or orangy light. Some diamonds fluoresce when they are exposed to long-wave ultraviolet (UV) rays from sources like the sun. Can the average person tell the difference between diamonds that do and don’t fluoresce?įluorescence is the glow you sometimes see when an object emits visible light.Does fluorescence cause haziness in diamonds?.Does diamond fluorescence make a yellow diamond look “whiter”?.How should you take fluorescence into account when choosing the perfect diamond? In this article, we’ll cover: It can also affect diamond appearance-or not. It can sometimes increase or decrease the value of a diamond. Courtesy: Chip Clark, Smithsonian Institutionĭiamond fluorescence is a fascinating phenomenon where diamonds glow when exposed to long-wave UV rays.
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