Loose Diamonds Search

What is Diamond Fluorescence?


Diamond fluorescence is easily one of the most misunderstood and over-rated characteristics of a diamond.

A diamond is said to have fluorescence when it self illuminates due to exposure to radiation such as ultraviolet light or
x-rays. This luminescence is typically a soft blue hue.

Under normal lighting conditions, except in rare instances, this effect is not discernable to the eye. To see a diamond fluoresce, it must be viewed under black (ultra violet) lighting as shown in the image to the right.

Diamond fluorescence
Faint blue, medium blue, and strong blue fluorescence.

Diamond Fluorescence Rating and Price

The amount of fluorescence in a diamond is rated as none (sometimes shown as negligible), faint, slight, medium, strong, very strong, and intense (sometimes shown as distinct). At Novori Jewelry, we do not sell diamonds with a fluorescence rating stronger than strong blue because it has a higher chance of affecting the value of the diamond.

In some instances, but not always, a strong blue, or very strong blue fluorescence can cause the diamond to appear milky or cloudy. For this reason, a diamond with any level of fluorescence typically retails for less than a diamond rated as having no fluorescence. Is this fear of fluorescence justified? Not really. If a medium to strong fluorescence reduces the price then that just works to the purchaser's benefit. At Novori, we will examine your diamond for you on the off chance that the fluorescence is affecting the diamonds appearance.

GIA (Gemological Institute of America), the world leader in
diamond grading and gemstone identification underwent an extensive study of diamond fluorescence in 1997. This is an excerpt from that study:

"For the average observer, meant to represent the jewelry buying public, no systematic effects of fluorescence were detected. Even the experienced observers did not consistently agree on the effects of fluorescence from one stone to the next. In general, the results revealed that strongly blue fluorescent diamonds were perceived to have a better color appearance when viewed table-up, with no discernible trend table-down. Most observers saw no relationship between fluorescence and transparency."

Diamond Fluorescence Rating and Diamond Color

In the 1920's, diamonds with a blue fluorescence and a color rating of colorless were referred to as "blue-white" and were highly sought after. Unfortunately, sales people used the term too loosely for any diamond with fluorescence and the term "blue-white" was outlawed by US trade practices laws.

While fluorescence will normally have no impact on a diamond's clarity, there are those who claim it can potentially have some minor value towards a diamond's color. The idea is that the slight yellowish tinge is cancelled out to some degree by the slight bluish hue of the fluorescence. This idea is not strongly supported by the GIA findings in their study on fluorescence.

What Makes a Diamond Fluoresce?

When a diamond is in its natural state, its electrons are stable. If when a diamond is exposed to UV radiation the electrons become excited they move in and out of a high energy state. When the electron relaxes from its high energy state back to its natural low energy state, it releases the excess energy. This released energy is measured in its wavelength. A emitted wavelength of 420 to 450 nanometers will appear as a bluish hue.

97% of diamonds that fluoresce display a blue fluorescence. The remaining 3% of fluorescent diamonds display colors of violet, green, yellow, orange, and red. Buying a colorless or near colorless diamond that has a fluorescence other than blue is not normally recommended. We do not sell diamonds that have a fluorescence that is not in the blue range.

Considerations When Buying a Diamond with Fluorescence

A diamond fluorescence diamond

The bottom line is that diamond fluorescence will not have a noticeable effect on your stone unless you are someplace where there is strong UV lighting (maybe a nightclub?). There is a noticeable difference in price however, so buying a diamond with a medium to strong fluorescence can be an attractive deal.

If you have any questions about a diamond on our web site with fluorescence, we would be happy to speak with you about it and have a gemologist inspect the stone for you.




diamonds Best diamond prices online
loose diamonds Free FedEx shipping to the USA
engagement rings No risk 30 day money back guarantee
diamond rings All engagement rings are made in the USA
wedding rings Registered with the Better Business Bureau
certified diamonds Huge selection of high quality diamonds
  More Reasons >>

Thanks you once again for your valuable advice, patience and creative jewelry expertise. My wife’s ring design caused considerably more ooo’s, ah’s and wow’s than we ever expected. At a time of many sensitive...
Douglas

View More


I got my ring this morning and all I can say is wow! Thank you for all your time and patience working for me. Have a great day....
Robert

View More


I do buy a lot online, but I research and review countless hours. I wanted a jeweler with superior craftsmanship and experience, while also having a selection that was unlike anything I saw locally. I...
Anthony

View More


I just wanted to let you know that I received my ring last week. There were delays over the weekend in customs. The ring is very nice. I just had it appraised...
Scott

View More


I just wanted to email you to say thank you for everything that you have done for me with regards to my engagement ring. As I told you on the phone, I really feel...
Sean

View More


I just wanted to take a moment to say thank you for the tension ring ordered from you. The ring is beautiful and the diamond is stunning. I know that when the moment...
Jorge

View More


I just wanted to let you know I received the engagement ring I purchased. It's exactly what I wanted. Simple and elegant, thanks so much I'm sure my girlfriend will love it....
Adam

View More


I just wanted to thank the staff at Novori for everything. I am not in the habit of writing thank you letters however, your service, communication and especially your dedication to taking care of this...
Gordon

View More


I just wanted to let you know that the shipment arrived yesterday without any issues. Thank you so very much for all the help, and the excellent service. I continue to be impressed...
Robert

View More


I just wanted to say Thank You for your help with the engagement ring. I got it last week, and Veesha (my fiancé) loved it. I owe you big time! You were...
Vishal

View More


I just wanted to thank you and the people at Novori for all the help that you provided me when buying an engagement ring. When making such an important decision on a purchase over...
Brandon

View More


I just wanted to thank you again for being so helpful during my purchase experience, it really made my decision a lot easier. The diamond was gorgeous and the proposal went very well, my...
Winston

View More


I just wanted to send you a quick note thanking you for the INCREDIBLE job you did on my fiance's ring. I appreciate all of the work that you did on the ring and for...
Stephan

View More


I just want to say, thank you for your business. Gorgeous Stone! I am overly satisfied and would recommend your business to anyone....
Rob

View More


We are very excited and so happy with the product you produce. Thanks for being so understanding and helpful throughout the process. Novori is definitely our recommended jeweler for the people who talk to...
Robert

View More



Diamond Jewelry Member
Novori BBB


Diamond Rings Payment Options

Credit Card Processing

 
  |    Home  |   Contact Us  |   Payment Policy  |   Return Policy  |   Privacy Policy |   Engagement Rings News  |   Diamonds  |   SiteMap  |  
   
  © 2004-2014 Novori Jewelry Inc. All rights reserved.     Terms and Conditions