IGI Webinar John Pollard & Garry Holloway

[Garry H (Cut Nut)]

This webinar is on Rapaport next week - if you dont want to watch it live - you can register and they will send you the youtube link later:

Seeing the Light: All You Need to Know About Light Performance in Diamonds | LinkedIn

Join us for our next exciting GEMTalks session on May 15 at 10 a.m. EDT as GEMTalks goes LIVE on LinkedIn. In this exclusive event, Leah Meirovich from Rapaport and Senior Director of Education at IGI, John Pollard and Garry Holloway from Ideal-Scope will explore the differences and uncover the...

www.linkedin.com

There is also a discussion on the Lab Grown forum where Karl, who worked with John in the design of the new IGI Light Performance methodology - that can be added to the round brilliant cut grade on an IGI report - on the right hand side of the report - similar to their H&A's images.
I am also told that if there are H&A's images the front view will be the Ideal-Scope image (as with JamesAllen True Hearts).

Fyi: IGI Scores Diamonds for Light Performance

https://www.idexonline.com/FullArticle?Id=49479

www.pricescope.com

 

[Karl_K]

A+
Great job John and Garry!
If you missed it catch it on youtube once it is posted there.

 

[0515vision]

What a great talk! So nice to “see” you and John.

Thanks for all the info about earring/pendant choices, too. As a relative lay person, I was under the impression that the choices for earrings/pendants were subpar stones. But of course those pieces face differently, and would gather light from a completely different angle than rings. Plus, I didn’t realize that at greater viewing distance, stones of a certain proportion lose contrast - hence a different set of cut parameters for those pieces.

Also, thanks for mentioning the loss of color in fancy colors with the improvement of optical symmetry. There was a recent thread where someone was told that a re-cut would result in a loss of color, and I think most of us were scratching our heads as to why. @jaqjaqjaq, was that you looking to recut a warm stone?

Anyway, huge thanks for that talk!

 

[jaqjaqjaq]

What a great talk! So nice to “see” you and John.

Thanks for all the info about earring/pendant choices, too. As a relative lay person, I was under the impression that the choices for earrings/pendants were subpar stones. But of course those pieces face differently, and would gather light from a completely different angle than rings. Plus, I didn’t realize that at greater viewing distance, stones of a certain proportion lose contrast - hence a different set of cut parameters for those pieces.

Also, thanks for mentioning the loss of color in fancy colors with the improvement of optical symmetry. There was a recent thread where someone was told that a re-cut would result in a loss of color, and I think most of us were scratching our heads as to why. @jaqjaqjaq, was that you looking to recut a warm stone?

Anyway, huge thanks for that talk!

Indeed, it was me!

 

[Garry H (Cut Nut)]

What a great talk! So nice to “see” you and John.

Thanks for all the info about earring/pendant choices, too. As a relative lay person, I was under the impression that the choices for earrings/pendants were subpar stones. But of course those pieces face differently, and would gather light from a completely different angle than rings. Plus, I didn’t realize that at greater viewing distance, stones of a certain proportion lose contrast - hence a different set of cut parameters for those pieces.

Also, thanks for mentioning the loss of color in fancy colors with the improvement of optical symmetry. There was a recent thread where someone was told that a re-cut would result in a loss of color, and I think most of us were scratching our heads as to why. @jaqjaqjaq, was that you looking to recut a warm stone?

Anyway, huge thanks for that talk!

Thanks 0515 - yes the contrast effect is a result largely of you looking at the diamond.
I want labs to grade color face up as well - that would be a total game changer - especially for fancy cuts!