4.26 carats round 3.6 HCA , aset evaluation questions

[GorgyBling]

newbie first post here.
Need input and advice for
4.26 carat round H VVS2 ex ex ex strong fluor
(10.58 x 10.64 x 6.35mm)
Table 59%
Depth 59.8 %
Crown angle 31.5
Pavillion angle 41.6
Lgf 75%
Star 55%
Crown height 12.5 %
Pavillion depth 44.5%
Thin to med gridle 3%

Before you look away just by reading the numbers (i know!) the low crown angle and steep pavilion are not the wisest choice
But please take a look at the aset image



And h&a images




I know that there'a an inverse relationship between crown angle and pavilion angle,
(Lower crown, deeper pavilion = more brilliance and less fire) but is the numbers above too extreme?
Is it still acceptable?

Here's the picture of the diamond



Any advice and input is aprreciated.

Thank you

-gorg

 

[flyingpig]

The diamonds in ASET/H&A image and actual photo are completely different.
Who's the vendor? This is the second time I recently noticed vendors providing images of completely different diamonds.

 

[yssie]

...Ditto, no way 59T 41.6P produces that ASET's table reflection. Actual photo looks right.

Whoever the vendor is had best get their QC under control quickly, if this is fact a repeat problem as flyingpig indicated might be the case!


Edit - I don't need an ASET to state that I personally would not want this stone - it is indeed far "too extreme" for me. Your definition of "too extreme" and mine may differ!
Objectively - it won't be a doozy. It would be neither the brightest nor the most fiery (at ring-wearing distance) in a lineup of well-cut stones, but it's certainly not going to be lifeless. It will perform poorly when the pavilion is dirty - more poorly than diamonds with different proportions, I should say, so keeping it clean will be extra important. Girdle is reported as a percentage of diameter, so even a "thin" girdle on a stone this size will be substantial, but I would strongly recommend a protective (8+ prong/halo) setting regardless given that crown - and if at all possible have the vendor you're buying from do the setting as well. I did not suggest a bezel because although very protective, even a low-lipped bezel is going to block direct (point source) light from those short low-angle crown facets.

TLDR - you are spending a substantial sum, I'm confident you can do better. I sympathise with your post as I know from experience that searching for well-cut stones in the >4ct range is difficult as pickings are (very very) slim unless you choose the precision-cut route... But patience will pay off eventually

 

[Texas Leaguer]

Consumers who are interested enough in cut quality to be analyzing light performance and optical precision diagnostic images in pursuit of a diamond purchase will naturally want to be assured that those images in fact correspond to the diamond under consideration.
Many merchants do not perform their own light performance imaging and instead depend on diamond manufacturers for actual and computer generated images, or a combination.

Manufacturers often process thousands of diamonds per month and keeping the data synched up can be challenging. Simple data entry errors cause mismatches. Merchants who do not have their own imaging capabilities have no way to verify the accuracy of those images, even if they eventually do physical inspections before shipping. (i.e., they are not pure drop shippers).

It’s a good practice to gain a full understanding of the acquisition and QC process that your merchant performs when you are making a large and highly specialized purchase.

 

[flyingpig]

Lets ignore the numbers for now and look at the actual diamond itself.

It lacks good contrast and the large circular table reflection dominates the table. These give the diamond one-dimensional and undefined appearance IMHO.

Now, lets assume the diamond has a perfect ASET image. One thing about the ASET is it reveals contrast, light return, and leakage, but tells nearly nothing about dispersion, which is responsible for fire/sparkle.

https://www.youtube.com/watch?v=Cz3qn2Tx6oI
I am not a big fan of Jann Paul's videos for using artificial light and camera environment that are unrealistic, although the very last envrionment is somewhat realistic.
But just focus on dispersion of light and fire of diamond A (extreme shallow/deep combo) compared to diamond B. Your diamond is more extreme

 

[Dancing Fire]

A low crown + a deep pavil = a big no,no in my book..

 

[GorgyBling]

The vendor is Wonderjewelers.com
Omg! How im so disappointed if indeed they gave me a different aset and h&a for this stone!
Should i confront them?
How to prove it to them?

 

[flyingpig]

The vendor is Wonderjewelers.com
Omg! How im so disappointed if indeed they gave me a different aset and h&a for this stone!
Should i confront them?
How to prove it to them?

First, mistakes like this do happen. I am sure they have thousands of images stored in their hard drive/server. How often do people attach wrong files in their personal and business emails? It is not rare. Having that said, it is absolutely sloppy of them when dealing with a customer who is interested in 4+ carat stone

Second, you don't need to prove anything to them. The ASET and the magnified photo are not those of the same diamond. The table reflection, contrast pattern/clarity, the shape of arrows, the thickness of arrows... It is all different. I even suspect the ASET and the H&A may not be those of the same diamond. You are potentially looking at images of three completely diamonds

Just ask them nicely to double check.

 

[Snowdrop13]

I used this as an excuse to look for a 4ct stone, sorry, couldn't help myself!

https://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-3600672.htm

 

[GorgyBling]

Thank you Yssie for your kind and thorough explanation.
I consider this diamond coz the aset looks quite good.
But in fact, the aset doesnt match the diamond in question.

Is 8 prongs/halo setting absolutely necessary for a diamond with a low crown angle? And thin girdle?
Or a 4 prongs is okay?

 

[GorgyBling]

Lets ignore the numbers for now and look at the actual diamond itself.

It lacks good contrast and the large circular table reflection dominates the table. These give the diamond one-dimensional and undefined appearance IMHO.

Now, lets assume the diamond has a perfect ASET image. One thing about the ASET is it reveals contrast, light return, and leakage, but tells nearly nothing about dispersion, which is responsible for fire/sparkle.

https://www.youtube.com/watch?v=Cz3qn2Tx6oI
I am not a big fan of Jann Paul's videos for using artificial light and camera environment that are unrealistic, although the very last envrionment is somewhat realistic.
But just focus on dispersion of light and fire of diamond A (extreme shallow/deep combo) compared to diamond B. Your diamond is more extreme

Thank you flyingpig,
Your honesty is really helpful
I've watched the video. I can see what you mean.

So is this diamond considered a 60/60 diamond?
If so, What is a good combination for a 60/60 ?

 

[diamondseeker2006]

This diamond is not one that I'd even consider with the low crown and crown angle. Please use the parameters below to be in the range of a well cut diamond.

These are measurements to help you stay in ideal cut territory with a GIA excellent cut stone.

table: 54-58

depth: 60-62.3

crown angle: 34-35.0 (up to 35.5 crown angle can sometimes work with a 40.6 pav angle)

pavilion angle: 40.6-40.9 (sometimes 41.0 if the crown angle is close to 34)

 

[diamondseeker2006]

Oh, and I'd start over with vendors. Many highly recommended ones on this forum.

 

[Karl_K]

The diamonds in ASET/H&A image and actual photo are completely different.

Good call, based on the numbers which are good only for a general idea due to rounding a perfectly cut diamond of those numbers would have an ASET image like this:

 

[Garry H (Cut Nut)]

Well Caught Team Pricescope!!!!
I think it is up to wonderjewelers.com to use their google feeds and see this reference - then come and PLEASE EXPLAIN.
wonder jewelers ?