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 >>

I proposed to my now fiance the other day and she honestly cannot take her eyes off of her ring. I leave for work, she is staring at it, I come home and she...
Zach

View More


I proposed to my fiance earlier this week and it went great! She loved the setting and stone from Novori. I was very happy with the value I got for my money....
Brent

View More


Absolutely beautiful. Again, thank you for all your help. I look forward to working with you in the future and letting all my friends know about your website....
Dan

View More


I found Novori through the internet. The website was very easy to use and assisted me in building my own ring. After doing so, I thought a mistake was made so I called,...
Zach

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


I just like to say that you have provided exceptional customer service and all my expectations have been met. I had my diamond ring appraised in Canada and it was exact to specs even...
Andrew

View More


The ring has arrived safely and it looks fantastic. Iíve seen nothing like it in the UK which makes it all the more special. Thank you very much for all your assistance over the last...
Gavin

View More


Hey, I got the ring yesterday in the mail. The ring looks even better than the picture, and I appreciate the speedy delivery. If I have need of more jewelry for my future...
Kelly

View More


The engagement ring ordered by Robert has arrived in Kuwait and found it's permanent home on my finger. I wanted to say thank you for the beautiful work. This ring is gorgeous!...
Tammy

View More


I received the ring I ordered today, right on time! ...and was blown away! I honestly can say I have never seen anything like it, the quality, and the sparkle will insure the proposal goes...
Jeremy

View More


I received the ring and it looks great. I want to thank you for all your help over the last couple months. I know I was demanding in what I wanted and you were a...
Andrew

View More


Thanks a lot for your assistance through this process. You've been a huge help, and I will be sure to let others know of my experience with you. I didn't think the timing and everything...
Victor

View More


I received the package and just wanted to let you know I think it is great. Thanks again for all your help and 'non-pressure' to buy the most expensive or anything really. Thanks...
Michael

View More


I wanted to drop you a line to let you know how satisfied I have been with your products and service. I ordered both my fiance's engagement ring and my wedding band from Novori...
Vince

View More


Thank you for your help in selecting our engagement ring. You were very patient with all of our questions and we were pleasantly surprised at how beautiful the diamond was. We could not...
Justin

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