In the world of diamond, the concept of fluorescence is often misunderstood and contradicted. As intriguing as it may sound, it is just a fascinating feature that naturally occurs in some diamonds. The diamond fluorescence refers to the reaction of the diamond when exposed to ultraviolet light. In other words, it refers to the emission of light by a diamond after being subjected to electromagnetic radiation like the ultraviolet light. As we are all aware, ultraviolet light makes your whites appear whiter while also making your teeth glow. So when the ultraviolet light comes in contact with a diamond, it emits a soft colored glow, which will continue to linger as long as it is exposed to the ultraviolet light.    

 Fluorescence is noticeable when placing a diamond under UV light.

Fluorescence is noticeable when placing a diamond under UV light.

Diamonds with fluorescence usually fluoresce blue, though it can also fluoresce other colors like yellow, green, pink, white, red and orange. Special ultraviolet lamps are used in the laboratory to identify the fluorescence effect on diamonds. The GIA grades fluorescence as None, Faint, Medium, Strong, Very Strong.  

Is Fluorescence Common?

Fluorescence is rather common and as per the GIA, reportedly 25% to 35% of the diamonds exhibit a certain intensity of fluorescence. Of these, 10% display a strength of fluorescence that may influence the appearance in a great many ways. 95% of the diamonds that display fluorescence, emits a blue color and very rarely does it discharge other colors like yellow or white.


Impact of Fluorescence on Diamond:

Generally speaking, the average person cannot distinguish between a diamond with fluorescence and a diamond without fluorescence. Fluorescence majorly do not have any impact on the physical appearance or beauty of a diamond. The GIA has already conducted an extensive research to understand the concept of diamond fluorescence and in the year 1997, they had published an article related to this.

Many a times when a diamond fluoresce blue, it has a positive impact as it makes the diamond appear whiter. To elaborate further; the diamonds that fall in the grade category of I-M color will appear one  or more grades whiter with the discharge of some fluorescence than the diamonds of the same category but without any fluorescence.

But sometimes diamonds with Strong or Very Strong fluorescence, may appear milky or oily or hazy and this effect may also be visible under normal lighting conditions. Though very rare, this haziness or milkiness may also appear in a Medium Blue Fluorescence diamond.

However, it must be kept in mind that fluorescence does not affects the structural integrity of the diamond.  Fluorescence should not be a major concern when deciding which diamond to purchase, if it doesn't appear to the naked eye.  The only concern should be when you are purchasing a diamond with Strong and Very Strong fluorescence in D-F color graded diamonds and G-H color graded diamonds respectively. In short, if you make a wise and correct choice, the fluorescence effect on the diamond will be negligible.


Posted by Roy Izakov.
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