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GIA certed with AGS parameters please explain

4Moonlite

Rough_Rock
Joined
Mar 19, 2016
Messages
81
I need an expert to explain what is the Contrast: .35 mean? Proportion deduction: 1?
The seller provide me some information about parameters measurement but I don't understand much. ASET image looks very good to me. What can you tell from this image?
I'll buy this stone tomorrow. Thank you

_3307.jpeg
 

MissGotRocks

Super_Ideal_Rock
Premium
Joined
Jun 23, 2005
Messages
12,190
It means that it took a .35 deduction in contrast which gives it an AGS1 score rather than an AGS0.

What are the specs of the stone?
 

4Moonlite

Rough_Rock
Joined
Mar 19, 2016
Messages
81
MissGotRocks|1461789568|4024293 said:
It means that it took a .35 deduction in contrast which gives it an AGS1 score rather than an AGS0.

What are the specs of the stone?
I guess.35 rounded to 0 instead of 1 I'm thinking about math or something?
If it rounds to 1 so what is the range or what is the rule of rounding?
It has excellent on HCA score. Any comments on ASET?
Thank you for your response.

_3308.jpeg
 

flyingpig

Ideal_Rock
Premium
Joined
Nov 7, 2015
Messages
2,175
From what I know, the final cut grade is AGS 1 mainly because of one full deduction in weight ratio (spread), which leads to one full deduction in proportion factor. The 0.35 deduction in contrast does not lead to any deduction in light performance, which is AGS 0; thus, it is not a determining factor for the overall cut grade. My guess is that the deduction in contrast is because of the skinny arrows from the lower girdle length of 80%+.

Contrast affects both brilliance and scintillation.
https://www.americangemsociety.org/uploads/85441435072031.pdf

I am curious. The diamond should have acceptable spread based on the girdle thickness (less than 4.0%)and 62.1% depth.
What is the carat weight?? what is the diameter??

Edit. Nevermind. It is the same stone from your previous thread. I hope you get more expert feedbacks for such significant purchase.
 

4Moonlite

Rough_Rock
Joined
Mar 19, 2016
Messages
81
flyingpig|1461795959|4024340 said:
From what I know, the final cut grade is AGS 1 mainly because of one full deduction in weight ratio (spread), which leads to one full deduction in proportion factor. The 0.35 deduction in contrast does not lead to any deduction in light performance, which is AGS 0; thus, it is not a determining factor for the overall cut grade. My guess is that the deduction in contrast is because of the skinny arrows from the lower girdle length of 80%+.

Contrast affects both brilliance and scintillation.
https://www.americangemsociety.org/uploads/85441435072031.pdf

I am curious. The diamond should have acceptable spread based on the girdle thickness (less than 4.0%)and 62.1% depth.
What is the carat weight?? what is the diameter??

Edit. Nevermind. It is the same stone from your previous thread. I hope you get more expert feedbacks for such significant purchase.
Thank you flyingpig for your response.
I watched GOG video about the lower girdle length from 65 to 85 he demonstrated larger % shows more flash,scintillation = small skin arrows. I hope this is what you are talking about 80%+.

The crown angle 35.37 is a little big or not a problem at all?
 

flyingpig

Ideal_Rock
Premium
Joined
Nov 7, 2015
Messages
2,175
Strictly speaking about the crown angle, based on the numbers and the given computer generated image alone, the crown angle of 35.3 should not be an issue in this case. It complements 40.6 pavilion angle. HCA confirms this and the ASET/AGS software shows no deduction in brightness, leakage, and dispersion, although it would be nice to see the actual IS/ASET, which may reveal more information.
 

4Moonlite

Rough_Rock
Joined
Mar 19, 2016
Messages
81
flyingpig|1461824936|4024507 said:
Strictly speaking about the crown angle, based on the numbers and the given computer generated image alone, the crown angle of 35.3 should not be an issue in this case. It complements 40.6 pavilion angle. HCA confirms this and the ASET/AGS software shows no deduction in brightness, leakage, and dispersion, although it would be nice to see the actual IS/ASET, which may reveal more information.
I see a little light leak on the table at 1 clock beside that I don't see anything else.
This is my first online diamond purchase and don't know much about diamond.
Any advice and recommendations will be appreciated. Should I buy the settings from them or have a diamond check and inspect first?

_3326.jpeg
 

teobdl

Brilliant_Rock
Joined
May 8, 2013
Messages
986
That diamond is fine. The light leakage is more likely due to the camera being marginally off than the diamond having facets off. It barely missed AGS0.

Platinum is better. It doesn't rub off when polished, doesn't discolor like WG does when the plating comes off, PT feels more substantial, and it's just a better material to hold diamonds bc of various strength and malleability properties. The only rationale why people choose WG is 1) price 2) they like the WG color better.

BTW take off your email bc it's against the rules.
 

4Moonlite

Rough_Rock
Joined
Mar 19, 2016
Messages
81
teobdl|1461968512|4025284 said:
That diamond is fine. The light leakage is more likely due to the camera being marginally off than the diamond having facets off. It barely missed AGS0.

Platinum is better. It doesn't rub off when polished, doesn't discolor like WG does when the plating comes off, PT feels more substantial, and it's just a better material to hold diamonds bc of various strength and malleability properties. The only rationale why people choose WG is 1) price 2) they like the WG color better.

BTW take off your email bc it's against the rules.
How to take down my email? Can't go back and edit that post
 

teobdl

Brilliant_Rock
Joined
May 8, 2013
Messages
986
click "report concern" on your post and ask the moderators to remove the email bit.
 

4Moonlite

Rough_Rock
Joined
Mar 19, 2016
Messages
81
teobdl|1461970156|4025298 said:
click "report concern" on your post and ask the moderators to remove the email bit.
Thank you for your help. I just submitted the request.
 
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