Help needed regarding contrast between arrows

[ZacharyLee]

Hi all,
I am considering a whiteflash ACA diamond, I am a little concerned about the contrast between arrows. Was wondering if any pros can shed some light on the issue.

Thanks,
Zac

 

[sledge]

I just recently suggested this stone to someone else in a different thread.

I see what you are talking about. Keep in mind the ASET image you linked above is the computer generated ASET that is based on the 3D scan AGS makes when certifying the diamond.

This is the actual ASET image taken and posted to the WF site. I will refrain from linking the diamonds while you decide, although I would advise you to call WF and place on-hold if you are getting serious as their stones move fast and people watch (and poach) stones based on threads here.

As you can see there is no leakage; however, you do have a couple of green slivers on the table showing less than perfect light return. As I recall, this stone had a 57 table, 61.7 depth and 34.8 crown and 40.9 pavilion.

Obviously the stone is cut to ideal standards; however, IMO you are seeing the effects of combining a higher crown with a higher pavilion. The beauty is WF has very controlled cutting techniques and provides you performance images to back up their work. There is nothing wrong with this stone, but if you are seeking a stone with a different angle combo and more perfect ASET, they do exist -- maybe just not for the price point you want to spend.

 

[whitewave]

Contrast is good in a super ideal diamond.

Article about contrast
https://www.pricescope.com/journal/role_contrast_diamond_appearance

https://www.whiteflash.com/about-diamonds/diamond-education/diamond-brilliance-1582.htm

 

[sledge]

Did you see @Texas Leaguer's response in your initial thread? I just noticed it myself, or would have refrained from my initial comments.

FYI, Bryan is the VP of WF so I would consider his response and input very valuable since you are considering purchasing this stone.

Him and I had the same thoughts about the crown & pavilion angles pushing the limits and the effects being seen is a result of that. Of course, Bryan gave a much more detailed response with more tech data. Please take the time to read what he had to say.

https://www.pricescope.com/communit...elp-in-choosing-diamonds.243467/#post-4411211

 

[crbl999]

I just recently suggested this stone to someone else in a different thread.

I see what you are talking about. Keep in mind the ASET image you linked above is the computer generated ASET that is based on the 3D scan AGS makes when certifying the diamond.

This is the actual ASET image taken and posted to the WF site. I will refrain from linking the diamonds while you decide, although I would advise you to call WF and place on-hold if you are getting serious as their stones move fast and people watch (and poach) stones based on threads here.

As you can see there is no leakage; however, you do have a couple of green slivers on the table showing less than perfect light return. As I recall, this stone had a 57 table, 61.7 depth and 34.8 crown and 40.9 pavilion.

Obviously the stone is cut to ideal standards; however, IMO you are seeing the effects of combining a higher crown with a higher pavilion. The beauty is WF has very controlled cutting techniques and provides you performance images to back up their work. There is nothing wrong with this stone, but if you are seeking a stone with a different angle combo and more perfect ASET, they do exist -- maybe just not for the price point you want to spend.

@sledge Bryan is going to run an additional scan on the stone later today. He did reply in your original thread and I have reposted it here for convenience.

OK, I see what you are referring to. These appear to be secondary reflections of the pavilion mains.
I notice that crown and pavilion angles are both pushing up against our proportion guidelines (34-35 and 40.6-40.9 respectively). This could possibly result in any variances in pavilion angles right at the red/green boundary to be revealed in these secondary reflections.
The ASET is within our very tight tolerances for A CUT ABOVE and the ray tracing from AGSL did not have even minor deductions in any of the light performance metrics. I will run a VPA on the stone later today to look at the variances in angles and azimuths.
Thanks for the question @crbl999 . It is an interesting observation.

I agree with @sledge that this will be an amazing stone. I purchased a similar stone several years ago from BGD. 1.007 G SI2 57.3 61.3 34.9 40.9 and it was absolutely beautiful! You will not be able to detect any performance difference with the naked eye. For me, it is a mind clean issue (her replacement stone has different proportions based on her preferences; smaller table and hopefully more fire).

 

[ZacharyLee]

Thanks everyone for your kind inputs! I have decided to move ahead and purchase this stone! (: have a great weekend ahead guys