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WHAT IS DIAMOND FLUORESCENCE?

by Enya Quinn March 22, 2021

If you have been out and about shopping for a diamond ring you may have come across the word “fluorescence”. So what does it mean? Fluorescence is the term given to the glow that a diamond emits from being exposed to ultraviolet (UV) rays. So some people may see it happen to their diamond jewellery if they’re getting their nails done and put their hand under the UV lamp or if they find themselves in a nightclub where UV light is heavily used and there is fluorescence in their diamonds. This glow is most commonly blue in colour but it can also be yellow, orange or white and disappears once the diamond is moved away from these rays.

According to GIA about 25% to 35% of diamonds submitted to them for grading in the past 10 years exhibit some degree of fluorescence and only a small amount of those showed enough fluorescence to impact the diamonds appearance.

What effect does fluorescence have on a diamond?


In most cases, the appearance of a diamond with strong fluorescence is rarely affected, but some believe it can make diamonds with a low colour grade look whiter in natural daylight and some diamonds with a high colour grade may look milky and lifeless in daylight. Luckily, fluorescence has absolutely no impact on a diamonds integrity.


Diamond Fluorescence Grading

(Source: GIA.com)

A diamond’s fluorescence grading is actually a characteristic description of it’s intensity rather than a grading like the 4C’s. This runs from None, Faint, Medium, to Strong and Very Strong and is stated on a GIA Diamond Grading Report.

Is diamond fluorescence good or bad?

Diamond fluorescence

(Source: GIA.com)


To be frank, fluorescence doesn’t have much of an effect on diamonds to say whether it is good or bad. To some, fluorescence is bad but to others it’s actually pretty cool so it really is down to personal preference. At Gear Jewellers we aim to have no fluorescence in our diamonds as we want our diamonds to sparkle
brilliantly in all lighting conditions.

If you wish to know more about diamond fluorescence or view our diamond engagement rings then you can book a virtual appointment with one of our diamond specialists, we would be happy to help guide you through the world of diamonds.



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