Does Good Real ASET + Tolkowsky Cut Show in GIA= Great Light Performance in Real Life

[Octopus_loves_blingbling]

Hello,

I found that some online stores provide a GIA/AGS + real ASET combination reports.
Here is the question "Can I say a diamond would have great light performance in real life if it associated with exact Tolkowsky Cut (34.5 Crown, 40.8 Pavilion) in GIA and a good real diamond ASET?" Is there any information that these two reports do not take into considerations but meaningful to estimate a diamond light performance?

A problem raised here for me is the deviations of the diamond's proportion measurement, for example, GIA has a 0.5degree interval for the average crown angle. So a Tolkowsky Cut diamond show on GIA might not be an "exactly" Tolkowsky Cut diamond.

I guess advanced Sarin report, which I can also get from one of the online stores, maybe works here Because it provides all facets' measurement instead of a range or an average number. But I don't know how to implement all these measurements from Sarin report.

It would be great if you could link me some pre-discussed threads and even greater a paper about these questions
I really appreciated all these information throughout my way to THE diamond

Thank you

 

[Lorelei]

There should be threads and articles in the archives if you try the search tool.

 

[blueMA]

A diamond can easily deviate from the exact Tolkowsky and be a top performer. At the T ideal range, the chances are that you'll likely get more balanced brightness and fire out of a stone, but many also prefer 34/41 or 35/40.6 combos or even more extremes towards BIC/FIC cuts depending on their subjective preference for brightness/fire. If a stone is within the ideal range and passed the HCA score, the next step is to see if you like the stone IRL. The exact math/proportions doesn't guarantee an ideal performer for someone.

 

[Octopus_loves_blingbling]

Thank you Lorelei. Thank you BlueMA.

I have read a couple of previous threads associated with Sarin report issued at 10 years ago. It seems there was not a clear way on how to use the advanced Sarin report's measurements at least 10 years ago. Not sure if there is any new idea on it.

I understand seeing a diamond in real life might be the best way to choose a diamond. But considering the cost of buying a diamond in jewel stores, I prefer buying online.

The problem here is that "is there any limitations or problems that the real diamond ASET does not take into consideration?"

Thank you

 

[Lorelei]

Sounds to me like a 'test' concerning ASET knowledge. I'll leave this one to the others.

 

[rockysalamander]

s there any limitations or problems that the real diamond ASET does not take into consideration

Of course. The ASET is looking at the light return to the viewer within a set of parameter to represent real life. They are quite useful in that way. But, they can't predict preference or beauty, which are far more subjective. All the tools we use (angle, SARIN, ASET, IT, H&A) are to evaluate the physical parameters of the stone. However, the observer of the stone may not prefer that kind of stone. So, imagine two diamonds with great angles and ASET. But, one is a 60/60 and one a "ideal". The viewer of these may prefer the more brilliant (white light) over the firey one. They may prefer the wider table of the 60/60 over the generally smaller one of the "ideal". Minor flour in the higher latitudes may be impossible to see, but put that same diamond at the equator and that minor flour may be more prominent -- which may or may not be a preference. If the wearer family all wore old cut stones, they may prefer high crowns and small tables --- or just the opposite.

The list goes on, but this is when we discuss options here, we'll try to give you some narrative to help. And we often explain why we prefer what we do. But, in the end, we are all trying to use science to predict beauty.

 

[Garry H (Cut Nut)]

If there is a speck of dust under one edge of the table when a diamond is being held in a tool while polishing all the crown and pavilion angles can be off because the tilted table exaggerates all the differences by 2X. But such stones can still show H&A's and be great lookers.

 

[diamondseeker2006]

A report, ASET image, and magnified photo of a stone are totally acceptable to help one choose a well cut diamond online. We do it all the time. Study the ASET images on a site like Whiteflash (their ACA top cut stones), and then you know what great ASET images should look like.

 

[Octopus_loves_blingbling]

Thank you