HRD: strong fluo. has a positive influence on the color of diamonds.

[diagem]

Just got this email from HRD Antwerp, “scientific analysis of grading (near) colorless fluorescence diamonds”, “details of the study will be released during the HRD Antwerp lecture at the HK Jewellery & Gem Fair on Thursday September 13”

Interesting view so it seems:
“HRD Antwerp, Europe’s leading authority in diamond certification, recently undertook a study entitled “The effect of fluorescence on the colour of a diamond”, concluding that even strong fluorescence does not negatively impact a diamond’s appearance. In fact, their findings demonstrate the contrary: under normal conditions and even when outdoors, strong fluorescence has a positive influence on the colour of diamonds. This finding directly contradicts the common perception that fluorescence is a negative property of diamonds, driving down their value. Given HRD Antwerp’s findings, they conclude there is no justification for the price penalties that currently apply to fluorescent diamonds.”

https://hrdantwerp.createsend1.com/...EF23F30FEDED/B873EB7D3FCA8FF40F8C96E86323F7F9

Have been lauding this for years, nice to see some positive noice on the subject of colorless diamonds and fluorescence.

 

[Karl_K]

Hopefully more details are released once it is presented.
Hopefully it is better than the blurb and covers over blues and colors other than blue.
I highly doubt they did it but a study of other wavelengths than the grading one would be even more helpful.

 

[Rockdiamond]

Hi Yoram!
I think the HRD statement is misplaced
My main concern is that it's overly general. Fluorescence takes many different forms, in different diamonds.

In fact, their findings demonstrate the contrary: under normal conditions and even when outdoors, strong fluorescence has a positive influence on the colour of diamonds.

That one statement invalidates their entire stance- which is a shame because there are inequities and misunderstandings inherent in the system- that they do point out.
The general thought I find among dealers is that GIA is tougher on yellow diamonds with fluorescence.
This means that a diamond which GIA grades "Fancy Yellow" that possesses Medium Blue may face up like a Fancy Intense Yellow with no fl.
I agree that fluorescence can make a yellow look yellower- but in other cases, Medium or Strong Blue kills the color- totally.
I've seen yellow diamonds where I can spot the fluorescence in a heartbeat- with no UV lamp. Stones that are truly dull- and the yellow is not pure.
My experience is that not all Medium or Strong Blue stones are a problem due to the fluorescence- however many are. This doesn't solve the issue- but HRD is way off base IMO

 

[diagem]

Hi Yoram!
I think the HRD statement is misplaced
My main concern is that it's overly general. Fluorescence takes many different forms, in different diamonds.

That one statement invalidates their entire stance- which is a shame because there are inequities and misunderstandings inherent in the system- that they do point out.
The general thought I find among dealers is that GIA is tougher on yellow diamonds with fluorescence.
This means that a diamond which GIA grades "Fancy Yellow" that possesses Medium Blue may face up like a Fancy Intense Yellow with no fl.
I agree that fluorescence can make a yellow look yellower- but in other cases, Medium or Strong Blue kills the color- totally.
I've seen yellow diamonds where I can spot the fluorescence in a heartbeat- with no UV lamp. Stones that are truly dull- and the yellow is not pure.
My experience is that not all Medium or Strong Blue stones are a problem due to the fluorescence- however many are. This doesn't solve the issue- but HRD is way off base IMO

David, you’re mixing...

Re-read the first paragraph.

“scientific analysis of grading (near) colorless fluorescence diamonds”,

And it continues with “details of the study will be released during the HRD Antwerp lecture at the HK Jewellery & Gem Fair on Thursday September 13”

Let’s give them a chance at it, as I believe they might be up to something...., it makes pure sense to me.

 

[Rockdiamond]

ooooops!!! Sorry, I was too quick to the draw
Still- even if we're considering colorless ( or near), there's simply no way to accurately make such a blanket statement.
Sometimes, fluorescence is a boon- really improving the color- and other times medium or strong blue stones show easily visible negative visual effects.

 

[Dancing Fire]

Under the sun...
The bigger stone is a GIA none and the smaller stone is a AGS med blue.



The same GIA none and a AGS VSB

 

[Rockdiamond]

I agree with Yoram that we should give HRD a chance- and hope they did come up with something useful.
As Dancing Fire’s pics show, sometimes stones with MB/SB show obvious blue, others do not.
In my own experience I’ve not found other correlating factors. In other words, an SB or MB diamond may or may not have either a blue tinge and or haziness. Not all stones that show blue are hazy. Not t all hazy stones show a blue tinge.
The characteristics of Fluorescence in a given diamond are not related to any other aspects we commonly assess such as body color, clarity, shape, size, cut quality, etc.

Haziness, or the ability to show blue are random as far as I can tell.

 

[BlingDreams]

My D with SBF is as crisp and white as it gets. I have never seen any negative effect from my florescence, and I believe it even shows up whiter than a normal D. That being said, this article makes me sad as I now wonder if the price break currently given for fluorescent diamonds might go away; I have (had?) plans to buy many more in the future!

 

[Dancing Fire]

My D with SBF is as crisp and white as it gets. I have never seen any negative effect from my florescence, and I believe it even shows up whiter than a normal D. That being said, this article makes me sad as I now wonder if the price break currently given for fluorescent diamonds might go away; I have (had?) plans to buy many more in the future!

This is what Lesley told me last month when I bought the 2.05ct med blue on behalf of my daughter's bf, Lesley said, ...the price b/t a none vs blue flour stone is getting narrower these days, b/c prices for blue flour roughs have gone up lately. IOW, ..Don't expect a big discount for blue flour stones like it was in the past.

 

[LoveWins]

Under the sun...
The bigger stone is a GIA none and the smaller stone is a AGS med blue.



The same GIA none and a AGS VSB

Beautiful stones