Help with ASET & Idealscope images!

[AJ37]

Thank you both DejaWiz and Karl. I did find the second article much more clear. I think I needed the actual images, bc I had read about this concept and it’s importance here before on PS and never got it when I looked at diamonds.

 

[Ibrakeforpossums]

When I first in interested in diamonds I wondered, how do they get inside and make all those little cuts? Really, almost. Still getting answers to this with articles like the one above.

 

[Garry H (Cut Nut)]

Garry,
It's important not to conflate what the research actually concludes with anecdotal personal preferences. It can be misleading to the pricescope visitors who may not want to take a deep dive into the research papers themselves.

It's also important to understand that GIA has a huge trade constituency and have for years been trying to remove the stigma associated with fluorescence in order to increase inventory value and sell-through rates for that constituency. To their credit GIA acknowledges that goal, in this case in the Introduction of the article.

"Our goal is to provide a better understanding of the effect of blue fluorescence on diamond appearance and quantify it instrumentally. We believe this will help to reduce the confusion and biases in the industry and serve as a solid scientific foundation to ensure public trust with respect to diamond fluorescence."

And what I find particularly interesting in this study is the fact that while attempting to "ensure the public trust" GIA reveals another potential problem with strong fluorescence in loss of contrast.

Bryan you are totally doing what you asked me not to.
I simply reported that the main author and researcher also prefers blue fluorescent diamonds as a way to mollify the fear factor that you threw out.
As you and many people hear know I have been warning people on this forum to avoid even Medium fluorescent diamonds that have significant clouds and internal graining.
Pretty sure you and others heard that first from my observations, along with warnings when the fluoro color is whitish pale blue. Correct me if I am wrong please.
I have also been the first, I believe, to point out that viewing diamonds in direct sunlight and blaming fluorescence for them appearing dark blue or black and that people should not do that at all.

 

[Garry H (Cut Nut)]

This one is easier to understand:

Virtual Facets and patterns, a Discussion about step cuts.

This is the next article in the discussion of step cut diamonds. The main goal of this article is to show how virtual facets form patterns in diamonds. This is […]

www.pricescope.com

For the record, Sergey Sivovlenko and Dr. Yuri Sheleminitiev invented the term.

OctoNus MSU breakthrough

Sergey and Yuri have made an amazing new discovery 9over the past 2 years) that radically changes the ray tracing approcah. Sergey will send anyone who declares their name and interest, company etc and email address to him - a pre publication short but very complex doc about it all...

www.pricescope.com

 

[tysaval]

You may not see much - although with a cheap UV penlight you will see a lot stronger blue than faint because historically GIA used the wrong long wave UV (365mn) to assess diamond fluorescence.
Also the grow light needs to appear white - not the blue red LED's

I need another opinion I bought this diamond with faint fluorescent E color I fell like it is stronger than faint. But I could be me??? Can you have a look at it and give me your opinion

 

[Texas Leaguer]

Bryan you are totally doing what you asked me not to.
I simply reported that the main author and researcher also prefers blue fluorescent diamonds as a way to mollify the fear factor that you threw out.
As you and many people hear know I have been warning people on this forum to avoid even Medium fluorescent diamonds that have significant clouds and internal graining.
Pretty sure you and others heard that first from my observations, along with warnings when the fluoro color is whitish pale blue. Correct me if I am wrong please.
I have also been the first, I believe, to point out that viewing diamonds in direct sunlight and blaming fluorescence for them appearing dark blue or black and that people should not do that at all.

"the fear factor that you threw out." Really Garry?
I was quoting from the GIA study that you first referenced in the thread.

The finding of loss of contrast due to strong fluorescence was important enough for the authors to reference it in their introduction, as well as devote a significant part of their conclusions talking about it. In fact, the "bulk contrast" methodology was a central part of this study on the effects of fluorescence on diamond transparency.

The fact that the study discovered contrast loss due to fluorescence (I believe this is the first time it has been reported), may be an inconvenient truth for those promoting the 'benefits' of fluorescence, but it surely is not fear mongering to mention it.

The importance of this aspect of the study is underscored in their final remarks speculating that this methodology my one day be used to add a transparency metric to GIA grading reports, something I have been advocating for several years.

 

[diamondseeker2006]

I need another opinion I bought this diamond with faint fluorescent E color I fell like it is stronger than faint. But I could be me??? Can you have a look at it and give me your opinion

The only way to really see faint fluorescence is to shine a UV penlight on the diamond, preferably in a dimly lighted room. It's totally fine in these pictures. I haven't read through the other posts, but I would almost never be concerned about faint fluorescence. I am also not concerned about greater blue fluorescence in stones with higher clarity.

 

[Garry H (Cut Nut)]

I need another opinion I bought this diamond with faint fluorescent E color I fell like it is stronger than faint. But I could be me??? Can you have a look at it and give me your opinion

Taking photos like this - especially in direct sunlight - are not going to tell us anything about fluorescence.
If your Faint is closer to Medium you have a winner (unless Bryan gets to you hahahaha).
Get your self a cheap UV torch and take some more photos. The cheaper the torch the better.

 

[Garry H (Cut Nut)]

"the fear factor that you threw out." Really Garry?
I was quoting from the GIA study that you first referenced in the thread.

The finding of loss of contrast due to strong fluorescence was important enough for the authors to reference it in their introduction, as well as devote a significant part of their conclusions talking about it. In fact, the "bulk contrast" methodology was a central part of this study on the effects of fluorescence on diamond transparency.

The fact that the study discovered contrast loss due to fluorescence (I believe this is the first time it has been reported), may be an inconvenient truth for those promoting the 'benefits' of fluorescence, but it surely is not fear mongering to mention it.

The importance of this aspect of the study is underscored in their final remarks speculating that this methodology my one day be used to add a transparency metric to GIA grading reports, something I have been advocating for several years

At 52 minutes in this excellent video on the article Yun Luo mentions her fluorescent diamond preference.
I also asked her directly in a pervious private video to the NYC Alumni and got a stronger positive response.

Fear because the mere mention of a negative outweighs its value Bryan.
The actual effect is the dark blacks become blueish.
I have observed this many times and have reported it in private coms to Karl and my R&D associate Grant Pearson prior to this excellent article. I could dig up one of my first awareness and the huge increase in brightness that results that far out weighs any contrast loss Bryan.

And yes - we have both banged on for years about transparency grading. I also asked Yun Luo that directly and she said "I hope the lab will institue this"

 

[Garry H (Cut Nut)]

oops - at 52 minutes - but watch the entire thing as it may be faster and better than reading the article