Diamond Fluorescence Tips to Make Her Ring Shine


If you intend to purchase a diamond with H, I, or J color, be sure that it holds a Medium Blue fluorescence just like this stone or this stone for a nice extra perk – it will make your stone appear a bit whiter. But just don’t stress yourself too much about it (your diamond will still look superb without it).

But if you want to purchase a diamond with a G or higher color, it would be best to opt for one that is either fluorescent free or has a slight fluorescence. If not, settle for any piece from the Brian Gavin Blue Collection and put your money on an I or J color diamond to get the most out of your investment.

Bear in mind, however, that these guidelines are not absolute and will not work for every diamond. If you want help on a special kind of diamond, we implore you to contact us anytime you are free.

1) Defining Diamond Fluorescence

Fluorescence pertains to the extent to which a diamond reacts when exposed to ultra-violet light. UV light is a form of radiation, which is not visible to the human eye. Different objects will appear differently under UV light. There are diamonds, for instance, that exhibit different colors when subjected to UV light. But we won’t go deeper into the nature of UV light and its effect on diamonds. If you want to know more about the topic, simply input “diamond fluorescence” in Google or any other search engine, and I’m pretty sure you will become illumined on the science behind the special glow.

Almost all of the time, however, the glow would be blue and in special cases, the diamonds will glow white, yellow, green, or even red. But this is just a small part of a bigger and more complex picture.

2) Strong Blue Fluorescence

But if the diamond will only glow when subjected to UV light, it won’t matter to any person right? Unless, of course, that person lives majority of his life in dark rooms with black light lamps like disco clubs and the like.

This is not simply the case, however, a majority of diamonds which manifest Strong Blue Fluorescence look vaguely to severely blurred under normal light.

If you’ve done some research about diamond fluorescence in Google, you have probably stumbled upon a particular GIA study declaring that even strong blue fluorescence is generally invisible to an ordinary diamond shopper.

3) High Fluorescence = Foggy Diamonds

Right now, I will say with absolute confidence that GIA’s claim on their study is complete nonsense. I have witnessed a whole constellation of diamonds in my 6+ years in the business and I can say with utter certainty the following:

  • Diamonds with Strong/Very Strong Blue Fluorescent typically look foggy
  • Diamonds with Medium Blue Fluorescent almost always never look foggy
  • Diamonds with Slight/Faint Blue Fluorescent never look foggy

4) Fluorescence has the Potential to Enhance Color

To some extent, the study does hold some shred of truth. Fluorescence does have the potential to enhance the visual quality of color in the diamond.

Thus, as I shared in the bottom line recommendation above, if you intend to purchase a diamond with an H color or higher, the best route would be to opt for a piece that has Medium Blue Fluorescence.

However, I hold some doubts on recommending a diamond that has Strong Blue Fluorescence, because even in lower color grades, it can sometimes appear milky and foggy. But the lower you stoop in color grades, the less likely it will appear milky. This is a great example of an exquisite J color diamond that is enhanced by the strong fluorescence.

5) My Personal Doubts about Fluorescence

Likewise, I also have some doubts in suggesting Medium Blue Fluorescence when buying a diamond with a very high color (G or higher), because on rare occasions, even a Medium Blue Fluorescent diamond can appear rather murky or foggy when the color is very high.

Certainly, if you are purchasing the diamond personally and not online, then it would serve you best to opt for a diamond with Strong Blue Fluorescence.

The diamond will cost less and because you are actually there, you can personally check if the diamond will appear foggy or milky.

6) Brian Gavin’s Blue Line

A compelling option if you’re purchasing online are diamond collections from Brian Gavin’s “Blue” line. Every diamond in the collection is personally cherry-picked by Brian Gavin himself to ensure that they don’t show any hint of murkiness or fogginess.

The fluoresce enhances the diamond’s physical look by making it appear clearer without any adverse reactions. What’s more, they appear as brilliant as his “Signature” line of Hearts & Arrows perfectly cut diamonds with one major difference – they cost a whole lot less! This beautiful 1.17ct round diamond is a perfect example of a lovely diamond that is flawlessly cut. Because of the fluorescence effect, it appears a little vibrant and also cheaper.

These diamonds have been on the top of our recommendations list since the onset of 2012 and every person that has stuck to it has so far been highly satisfied.

7) Local vs Online Purchase

If you take the route of purchasing a diamond locally, you will certainly enjoy a significant amount of discount by opting for pieces that have Strong Blue Fluorescence. However, the amount of money you can save will become even more if you take the online route and purchase either a Medium or lower fluorescence.

Sadly, however, even James Allen with their high-end imagery, will not be able to portray how the diamond will appear face-up in direct sunlight.

1/5 - (1 vote)


Kevin Lee is a former tech advisor who cut his teeth in Silicon Valley. He now spends his time sharing his passion for investing in diamonds and jewelry. You can reach Kevin for any comments by using this form.