GIA Cut grade from an old post

[Garry H (Cut Nut)]

I was trying to find a photo that Marty Haske posted years ago showing how GIA's old lamps pumped out heaps of UV resulting in overgrading of blue fluorescent diamonds pre 2000.
If anyone has that photo or can find a thread?
(BTW have not heard from Martin for years - his site does not exist anymore. Does anyone know about him?)

Back to the topic:
Dave Atlas posted this in 2006 just after GIA launched their cut grading system - and it is so very true:

"If there is poor clarity, cloudiness or fluorescence these folks are going to "predict" light performance will not be different, but intend to put this lack of performance under clarity grading. Incredible! Here the consumer finds an "excellent" cut and thinks, "Sell, it isn''t a fabulous clarity, but it has a wonderful light performance.". Boy, they may well be surprised!

If a diamond has poor light behavior, then how can that component grade Excellent when it is obvious to any grader that this isn''t the case. How is good communication of the diamond''s appearance to be transmitted to end users or other dealers?

The jury is certainly not done deliberation on this hot topic. The GIA Symposium ws full of differing opinions and vbery thougtful people. Most of these people are dedicated to bringing honesty to the diamond trade. There is a very powerful, traditional minority that prefers the old smoke and mirrors stuff. This will change over time, but it won''t totally go away any time soon.

Using an expert is still going to be the right path for consumers who want assurance a particular diamond is right for them. I will say that the creation of cut grading systems by the major players is coming along, but there are plenty of knowledgeable people who are less than thrilled with what is now being offered. You take the good with the bad as things change."

David S. Atlas, GG(GIA)
Certified Sr Mbr(NAJA)
The original thread https://www.pricescope.com/communit...lower-light-performance-by-gia-and-ags.50121/

 

[diagem]

@Garry H (Cut Nut) ..., I havent heard the name Marty Haske for ages..., loved reading his common sense behind the science. Hope he is well!

 

[Garry H (Cut Nut)]

@Garry H (Cut Nut) ..., I havent heard the name Marty Haske for ages..., loved reading his common sense behind the science. Hope he is well!

Yes Yoram. Found his article.

ADAMAS GEMOLOGICAL LABORATORY & ADAMAS ADVANTAGE GEMOLOGICAL AND APPRAISAL SOFTWARE

ADAMAS GEMOLOGICAL LABORATORY publishes gemologically oriented software for the jewelry appraiser, jeweler, or student in gemology or mineralogy. The laboratory also provides technical consulting and jewelry appraisal services to the trade and the public and expert witness services to the legal...

web.archive.org

BTW I was meant to review something for you and forgot

 

[diagem]

Yes Yoram. Found his article.

ADAMAS GEMOLOGICAL LABORATORY & ADAMAS ADVANTAGE GEMOLOGICAL AND APPRAISAL SOFTWARE

ADAMAS GEMOLOGICAL LABORATORY publishes gemologically oriented software for the jewelry appraiser, jeweler, or student in gemology or mineralogy. The laboratory also provides technical consulting and jewelry appraisal services to the trade and the public and expert witness services to the legal...

web.archive.org

BTW I was meant to review something for you and forgot

I still consider you my friend...
Wow, remember this Haske article..., you are giving me a Deja vu!!
Marty definitely had his way of putting things..., I miss reading his perspectives on things.

Hoping he is well! Thank you for that memory lane run.

Have a great weekend.

 

[oldminer]

Below is a slightly more readable version of that ancient posting. Just as diamond cutting has come along over the years, so has my typing and ability to more clearly express myself:

"If there is poor clarity, cloudiness or fluorescence, these folks are going to "predict" light performance as if these issues did not exist. They intend to put this lack of performance under clarity grading. Incredible! Here the consumer finds an "excellent" cut and thinks, "Well, it isn't a fabulous clarity, but it has a wonderful light performance.". Boy, they may well be surprised!

If a diamond has poor light behavior, then how can that component grade Excellent when it is obvious to any grader that isn't the case? How is good communication of a diamond's appearance to be transmitted to end-users or other dealers?

The jury is certainly not done deliberation on this hot topic. The GIA Symposium was full of differing opinions and very thoughtful people. Most of these people are dedicated to bringing honesty to the diamond trade. There is a potent, traditional minority that prefers the old smoke and mirrors stuff. This will change over time, but it won't go away any time soon.

Using an expert is still going to be the right path for consumers who want assurance a particular diamond is right for them. I will say that the creation of cut grading systems by the major players is coming along, but there are plenty of knowledgeable people who are less than thrilled with what is now being offered. You take the good with the bad as things change."

 

[sledge]

@Garry H (Cut Nut) can you share what you are working on?

Also wanted to say thanks for sharing Marty's old post. I didn't know him but it reminded me of a conversation on here about fluor that occurred a year or two back and many of his points were ones I also concluded.

I genuinely enjoy learning and would like to see more technical content from the trade where deep information dives occur. I think select others would like to see this too. So hoping whatever you are working on can be shared & maybe scratch that itch.