Things to Know about Diamond Fluorescence

GIA Grading
Diamond Fluorescence Facts

One of the things about the diamond, which makes most of the shoppers wonder a lot, is diamond fluorescence. Shoppers raise many questions regarding this matter, like what do you mean by diamond fluorescence, should you purchase a diamond for the same, is it good, etc. Below are the answers to some of those common questions people have regarding the fluorescence of diamonds.

Diamond Fluorescence

Fluorescence is actually the ability of a substance to glow in the dark by emitting the light or radiation it had absorbed. Some of the diamonds show the property of fluoresce if they lie in contact with the ultraviolet rays of the sun. For example, some diamonds would emit a bluish colored light, while other rare diamonds may even emit a yellow or orange colored light at the same time. However, the diamond would stop showing the property of fluorescence once they are kept away from the UV light source.

Note that not all diamonds exhibit the property of florescence, only about 25% to 35% of diamonds show signs of this property to some extent.

Diamond Fluorescence and GIA Grading

The GIA regards fluorescence as a distinguishing trait for the diamond. However, this cannot be regarded as a grading factor like that of the 4 C’s of diamond quality (clarity, carat weight, color, and cut). The GIA grading reports define this property by the intensity of diamond fluorescence (Medium, Faint, Strong, Very Strong, and None) when comparing them to the master stones they use in the lab. If the diamond exhibit Strong, Very Strong, or Medium fluorescence, the color could be visibly noted.

Difference between Diamonds with and without Fluoresce

GIA had done a lot of studies about the result of blue fluorescence on the appearance of the stone. The agency evaluated several diamonds by putting them together into four sets with each set containing six diamonds and the groups represented various color grades (E, G, I, and K) of diamonds. All of the diamonds in each of the groups were similar in all aspects except for the strength of blue fluorescence they emit. Average observers, diamond graders, and trained professionals perceived the diamonds in a controlled environment for judging the look of the diamond.

This is what they found out: “For the average observer, meant to represent the jewelry buying public, no systematic effects of blue fluorescence on the face-up appearance of the groups of diamonds were detected. Even experienced observers did not consistently agree on the effects of fluorescence from one stone to the next.”

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