Help! HCA 1.1 but AGS is NOT 0 - light performance concerns?

[hungryhungrydinosaur]

Hello! My partner and I would like help evaluating a potential center stone.

We found a diamond that scores well on HCA (1.1 with excellent in all 4 categories), looks great in the video (to our amateur eyes) and appears to have good symmetry, but lies slightly outside the AGS/GIA ideal/excellent windows on the Diamond Screener Cut Estimator. I believe it would be an AGS 1. We are wondering how concerned we should be that it doesn't fall within ideal/excellent parameters on the Cut Estimator, in terms of light performance and "sparkle".

Photo:

Video: https://s3.us-east-2.amazonaws.com/idjcorp.aws.bucket/video/59957-LG.html
Specs:
1.2 EVS1
cut, polish, symmetry all excellent (graded by IGI)
table 59%
crown angle 33.5
pavilion angle 40.6
total depth 60.1%
measurements: 6.87 x 6.88 x 4.13

HCA 1.1
Light Return Excellent
Fire Excellent
Scintillation Excellent
Spread Excellent

Diamond Screener Cut Estimator graph:


Thank you everyone!!! We really appreciate it.

 

[lovedogs]

I would avoid it bc it's not gia or AGS graded. Therefore I don't trust the grading and you will likely overpay for inflated grading.

 

[OoohShiny]

You would need an ASETscope image to assess cut accuracy / consistency.

 

[hungryhungrydinosaur]

I would avoid it bc it's not gia or AGS graded. Therefore I don't trust the grading and you will likely overpay for inflated grading.

Thanks for your response. It's a lab-grown stone - if I recall correctly, the AGS/GIA will not grade them?

 

[hungryhungrydinosaur]

You would need an ASETscope image to assess cut accuracy / consistency.

Unfortunately, it doesn't look like I'll have that kind of image available to me.

 

[OoohShiny]

Thanks for your response. It's a lab-grown stone - if I recall correctly, the AGS/GIA will not grade them?

They do... but it's not currently the same as Mined diamonds:
https://www.pricescope.com/community/threads/gia-grading-of-lab-grown-diamonds.238380/

(You may have this thread moved into the MMD section because I don't think we're supposed to discuss laboratory grown diamonds in this Rockytalky section.)

Unfortunately, it doesn't look like I'll have that kind of image available to me.

You can purchase an ASETscope for reasonable cost, which you can then use at home to assess this and any other future purchases but I appreciate it is an additional cost.

The HCA score gives a good indication of if the crown and pavilion angles work together, but the ASETscope shows how consistent the cutting is, and whether you have any areas of leakage.

 

[lovedogs]

They do... but it's not currently the same as Mined diamonds:
https://www.pricescope.com/community/threads/gia-grading-of-lab-grown-diamonds.238380/

(You may have this thread moved into the MMD section because I don't think we're supposed to discuss laboratory grown diamonds in this Rockytalky section.)


You can purchase an ASETscope for reasonable cost, which you can then use at home to assess this and any other future purchases but I appreciate it is an additional cost.

The HCA score gives a good indication of if the crown and pavilion angles work together, but the ASETscope shows how consistent the cutting is, and whether you have any areas of leakage.

This. Move your thread to MMD so people can better respond. Because we aren't supposed to discuss them here.

 

[OoohShiny]

New thread:
https://www.pricescope.com/communit...s-is-not-0-light-performance-concerns.248028/

 

[hungryhungrydinosaur]

Darn, it looks like people stopped responding - unfortunate because I want to consider all the same factors in my stone!

 

[Karl_K]

The charts are just cutting guidlines they are not the actual score.
As long as the pavilion mains stay above 40.45 it will get ags0 on the real test.
It is a good combination for a 60/60 style stone as long as the mains are ok.
ASET wont help because there is 0 chance of this combo having excessive leakage given the picture and the numbers.
ASET does not in most cases show the issues caused by over shallow pavilion angles.

 

[hungryhungrydinosaur]

The charts are just cutting guidlines they are not the actual score.
As long as the pavilion mains stay above 40.45 it will get ags0 on the real test.
It is a good combination for a 60/60 style stone as long as the mains are ok.
ASET wont help because there is 0 chance of this combo having excessive leakage given the picture and the numbers.
ASET does not in most cases show the issues caused by over shallow pavilion angles.

What you're saying sounds pretty reassuring then? Thanks so much!

 

[flyingpig]

Just to add what Karl said, AGS's light performance grade is based on leakage, brightness, contrast, and dispersion. For this stone, if there were any deduction, it would come from either contrast or dispersion (or both). That's why the ASET is not very helpful.

 

[hungryhungrydinosaur]

Hello - my jeweler friend (who is remote) obtained these images. Any assistance interpreting them? Thank you!

 

[hungryhungrydinosaur]

They do... but it's not currently the same as Mined diamonds:
https://www.pricescope.com/community/threads/gia-grading-of-lab-grown-diamonds.238380/

(You may have this thread moved into the MMD section because I don't think we're supposed to discuss laboratory grown diamonds in this Rockytalky section.)


You can purchase an ASETscope for reasonable cost, which you can then use at home to assess this and any other future purchases but I appreciate it is an additional cost.

The HCA score gives a good indication of if the crown and pavilion angles work together, but the ASETscope shows how consistent the cutting is, and whether you have any areas of leakage.

Hello, my jeweler friend (who is remote) - who I think is somewhat inexperienced in the use and interpretation of them - took some ASETscope photos for me. Could you please help me interpret them? Thank you!

 

[Karl_K]

The images are not good enough for normal interpretation but i'm not seeing anything that changes my mind.

 

[hungryhungrydinosaur]

The images are not good enough for normal interpretation but i'm not seeing anything that changes my mind.

Here's a video of the stone!
https://imgur.com/a/NZ4oCAC

 

[Karl_K]

Here's a video of the stone!
https://imgur.com/a/NZ4oCAC

looks good

 

[hungryhungrydinosaur]

https://imgur.com/a/1eTUfaX Another video - with more fire!

 

[flyingpig]

love that sizzling fire