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Fluorescence is an invisible glow that a diamond emits under UV
rays. After evaluating hundreds of diamonds, we can confirm that often
exceptional diamonds are unnecessarily avoided due the presence of fluorescence
in them. As confirmed in the Gemological Institute of America (GIA’s) study,
we also confirm that in most cases consumers will not be able to detect the
presence of fluorescence in a diamond. Furthermore, a great majority of
diamonds with fluorescence can have as much brilliance as ones with no fluorescence,
and that the milky, hazy and oily looks in a diamond can also be found in
stones with no fluorescence.
The most important factor in a diamond is its
appearance, and if you’re happy with how it looks, don’t worry about the
fluorescence in it. In addition, enjoy the 4-15% discount that you might get
when you buy a diamond with fluorescence in it. In our opinion, the discount should be up to 2% for faint fluorescence, up to 5% for medium blue fluorescence, up to 12% for strong blue fluorescence and up to %18 for very strong blue fluorescence.
To top it all, if you buy your
diamond from Petra Gems, we’ll accept a return within 30
days with no questions asked in case if you end up not liking the fluorescence
in your diamond.
Of the diamonds submitted to GIA over the past decade,
around 25% to 35% of them exhibited some level of fluorescence. In under 10% of these diamonds, fluorescence affected the
appearance of diamond. However, this affect is not necessary negative and could sometimes
be complementary to the brilliance of the diamond.
The visible color is blue in more than 95% of
the diamonds that exhibit fluorescence and because blue is a complementary color to yellow, it would make tinted diamonds
look more like colorless diamonds.
None or No
After reviewing a random sample of 26,010 diamonds, GIA
found that only 9,175 or 35% exhibited some level of fluorescence. GIA notes
that “a report description of “none” means that any fluorescence exhibited is
weaker than that of the reference stone that marks the none/faint boundary.”
After reviewing a random sample of 26,010 diamonds, GIA found
that only 9,175 or 35% exhibited some level of fluorescence. Of the 9,175
diamonds, 38% or 3,465 were reported to
have faint fluorescence. Please note that GIA consider faint fluorescence
as the lower end of the blue fluorescence e.g. faint blue fluorescence, medium
blue fluorescence, strong blue fluorescence, and very strong blue fluorescence.
Medium to Very Strong Blue Fluorescence:
After reviewing a random sample of 26,010 diamonds, GIA
found that only 9,175 or 35% exhibited some level of fluorescence. Of the 9,175
diamonds, 62% or 5,710 had blue
fluorescence ranging from medium to very strong blue fluorescence. While
97% of these fluoresced blue in varying intensities, 3% or 162 stones
fluoresced other colors such as yellow, white and orange.
Of the 11,901 diamonds in the D-to-F range, a similar proportion fluoresced (4,250 diamonds, 36% of the total).
Some of our key observations on diamonds with fluorescence:
* Fluorescence in most diamonds
does not affect the overall appearance of the diamond. In fact, fluorescence
can be a positive factor for the appearance of the diamond in near colorless or
* Blue fluorescence can help
look near colorless diamonds look colorless. We have seen H color diamonds with
medium blue fluorescence that look like colorless diamonds to the naked eye.
* Strong blue fluorescence is
not necessarily bad! We have seen many diamonds with strong blue fluorescence
that has not had any negative effect on the appearance of the diamond. In fact,
once we observed an M color diamond look like near colorless diamond because of
very strong blue fluorescence.
* Diamond with very strong
fluorescence is not common. Most diamonds with very strong fluorescence are in
* Fluorescence is your friend
not foe because it can lower the price of the diamond by 4-10%. The price of a
diamond is not significantly affected if the diamond has medium blue or faint
* In some cases, diamond
fluorescence might affect the overall appearance of the diamond. Avoid diamonds
with fluorescence that makes the diamond look hazy, oily or cloudy. In very few
cases, fluorescence might make a diamonds look hazy or cloudy, and it is good
to avoid such diamonds. Ask your diamond dealer about such possibility prior to
make the purchase.
* Inquire about the return
policy of the diamond dealer and make sure you have a strong return policy if
you end of not liking the look of your diamond because of its fluorescence or
for any other reason/s.
* It is common for high grade
diamonds to have blue fluorescence such as D or E color diamonds. Fluorescence
is also common in F color diamonds.
Let fluorescence work in your advantage:
- You might be able to get between 4% to 10% discount on your
diamond purchase without compromising on the overall quality of the diamond. In our opinion, the discount should be up to 2% for faint fluorescence, up to 5% for medium blue fluorescence, up to 12% for strong blue fluorescence and up to %18% for very strong blue fluorescence.
- Medium blue fluorescence might enhance the color of your diamond
if it is within H-L range or higher.
- Faint fluorescence will also help you save money on your diamond
without losing its overall brilliance.
- When buying a diamond with fluorescence make sure you have the option of returning it just to be on the safe side.
Key Findings of
the GIA study:
- For average buyers (consumers), no
systematic effect of fluorescence was observed.
- Even experienced observers or
graders did not agree on the effect of fluorescence on the stones they were
given to evaluate.
- Diamonds with strongly blue colored
fluorescence were perceived to be having higher grade than the actual color
grade of the diamond.
- Most observers did not find any
connection between fluorescence and diamond clarity.
This picture illustrates how different types of diamond florescence might look like in regular day light. As you compare them, you'll notice how hard it is to tell the difference between diamonds with no fluorescence and diamonds with different types of fluorescence while viewing them by naked eye without the help of any instrument. It is hard to tell the difference because all of these are high quality diamonds in terms of the four Cs as confirmed by GIA in the grading report. All of the above diamonds are graded by GIA.
Range of Diamond Fluorescence in GIA
None or no fluorescence, medium blue fluorescence, strong blue fluorescence, very
strong blue fluorescence, faint fluorescence, yellow fluorescence, and green flourescence, among others. Blue is the most common
form of fluorescence in diamonds.
Most of you have probably
noticed the term "Fluorescence" on GIA or AGS Diamond Grading Reports
or in Petra Gems blogs. The concept of fluorescence is often misunderstood. According
to GIA, fluorescence is the effect that ultraviolet (UV) light has on a
diamond. It delineates how much strength the diamond has against the long-wave
UV light. Fluorescence is an invisible glow that a diamond emits under UV rays.
GIA scale uses the following grades to identify fluorescence: None, Faint,
Medium, Strong, and Very Strong. More than 95% times, color of fluorescence is
blue, but diamonds can fluoresce other colors as well. Yellow is the next
common color a diamond will fluoresce, and any other color of fluorescence would
Because of the
invisible property, majority of the time, fluorescence will have almost no
impact on the aesthetics of the diamond. According to GIA, of the 25% to 35% of
the diamonds submitted to them that had fluorecence, only 10% of those diamonds had a slight effect
on the appearance of the diamond. A typical diamond wearer will not see that
effect if the grade of Faint, Medium Blue and in some cases Strong Blue fluorescence
What are some of the
There are some websites
that discuss fluorescence as a negative factor for diamonds. Two most
misunderstood concepts in fluorescence are the color and the strength of the
fluorescence. A diamond will look whiter if the diamond fluoresce blue. Don't panic
if the diamond fluoresce blue, in fact it is recommended in H to J color range diamonds. Most high color grades such as D-E will often have blue fluorescence
as well. In some diamonds, it is a negative factor if the diamond fluoresce yellow color.
As stated in the
beginning of this blog, the grade of fluorescence ranges from None to Very
Strong. Sometime diamonds with very strong fluorescence tend to have a milky
look even under everyday lighting conditions. To a typical observer, rarely your
diamond might appear dirty or cloudy under very strong fluorescence. A good
rule of thumb would be to double check with your diamond dealer about the
effect of fluorescence in the diamond you are considering to purchase. Avoid purchasing a diamond with extreme fluorescence in terms of strength.
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