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flystar168

Rough_Rock
Joined
Mar 13, 2016
Messages
19
Hi Everyone.

I am looking for one diamond with 0.8c to 0.9c, I found one as be below. how about the cut, Fire and others? Please give me some comments. Thank you in advance and look forward to your reply.

qq______20160314105850.jpg
qq______20160314105145.jpg
 

E B

Ideal_Rock
Joined
Aug 31, 2005
Messages
9,488
It's beautiful. As long as it's eye-clean, go for it!
 

Gypsy

Super_Ideal_Rock
Joined
Aug 8, 2005
Messages
40,198
Ditto EB.
 

flystar168

Rough_Rock
Joined
Mar 13, 2016
Messages
19
How about the light performance according as the IS pic, Does anyone give me some comment? how to judge the light performance from IS pic? thank you !!
 

flyingpig

Ideal_Rock
Premium
Joined
Nov 7, 2015
Messages
2,171
flystar168|1458203651|4006622 said:
How about the light performance according as the IS pic, Does anyone give me some comment? how to judge the light performance from IS pic? thank you !!
Well.. Whatever the IS/ASET you see on the diamond page is as good as it gets. That's why it is ACA. Notice solid red throughout under the table. No whiteness (light leakage) except around the edge.

http://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-3461753.htm
notice a few patches of white under the table
http://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-3625397.htm
This one is even worse.

Reference Chart
http://ideal-scope.com/reference-chart-ideal-scope-images/
 

flystar168

Rough_Rock
Joined
Mar 13, 2016
Messages
19
flyingpig|1458205721|4006626 said:
flystar168|1458203651|4006622 said:
How about the light performance according as the IS pic, Does anyone give me some comment? how to judge the light performance from IS pic? thank you !!
Well.. Whatever the IS/ASET you see on the diamond page is as good as it gets. That's why it is ACA. Notice solid red throughout under the table. No whiteness (light leakage) except around the edge.

http://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-3461753.htm
notice a few patches of white under the table
http://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-3625397.htm
This one is even worse.

Reference Chart
http://ideal-scope.com/reference-chart-ideal-scope-images/

Many thanks to flyingpig. Sorry, I am newbie.

Does the light performance affect "brilliant" or "fiery"?

for the first stone, I found one whiteness on the table as below with blue color mark on the IS pic



for the second stone, I found a big whiteness block on the table as below with blue color mark on the IS pic





So the first stone is better than second stone. right ?

qq______20160321150802.jpg

qq______20160321150901.jpg
 

flyingpig

Ideal_Rock
Premium
Joined
Nov 7, 2015
Messages
2,171
"Does the light performance affect "brilliant" or "fiery"?"

The Ideal-Scope gives us indications of a diamonds brilliance; i.e. its light return and leakage as well as its contrast (which has a lot to do with scintillation. (directly from idealscope website. http://ideal-scope.com/about-ideal-scope/)
Diamonds with high-dispersion have the greatest potential to exhibit fire (from AGS Document). All ACAs are AGS ideal in light performance. AGS light performance grade includes dispersion (along with brightness, leakage, and contrast). Stones with no significant deduction in these four sub category are awarded Ideal in AGS light performance.

Therefore, yes, the light performance affects (or is affected/measured by) both brilliance and fire. And the ACA stone you picked should have great brilliance and fire. It is just the best of the best

"So the first stone is better than second stone. right ?"
Yes, based on the IS images alone.
 

flystar168

Rough_Rock
Joined
Mar 13, 2016
Messages
19
flyingpig|1458546193|4008812 said:
"Does the light performance affect "brilliant" or "fiery"?"

The Ideal-Scope gives us indications of a diamonds brilliance; i.e. its light return and leakage as well as its contrast (which has a lot to do with scintillation. (directly from idealscope website. http://ideal-scope.com/about-ideal-scope/)
Diamonds with high-dispersion have the greatest potential to exhibit fire (from AGS Document). All ACAs are AGS ideal in light performance. AGS light performance grade includes dispersion (along with brightness, leakage, and contrast). Stones with no significant deduction in these four sub category are awarded Ideal in AGS light performance.

Therefore, yes, the light performance affects (or is affected/measured by) both brilliance and fire. And the ACA stone you picked should have great brilliance and fire. It is just the best of the best

"So the first stone is better than second stone. right ?"
Yes, based on the IS images alone.

OH, good job, thank you very much for you comment. :dance: :clap:
 

flystar168

Rough_Rock
Joined
Mar 13, 2016
Messages
19
flyingpig|1458546193|4008812 said:
"Does the light performance affect "brilliant" or "fiery"?"

The Ideal-Scope gives us indications of a diamonds brilliance; i.e. its light return and leakage as well as its contrast (which has a lot to do with scintillation. (directly from idealscope website. http://ideal-scope.com/about-ideal-scope/)
Diamonds with high-dispersion have the greatest potential to exhibit fire (from AGS Document). All ACAs are AGS ideal in light performance. AGS light performance grade includes dispersion (along with brightness, leakage, and contrast). Stones with no significant deduction in these four sub category are awarded Ideal in AGS light performance.

Therefore, yes, the light performance affects (or is affected/measured by) both brilliance and fire. And the ACA stone you picked should have great brilliance and fire. It is just the best of the best

"So the first stone is better than second stone. right ?"
Yes, based on the IS images alone.

but I notice that Crown Angle is 34.9 and Pavilion Angle is 40.7. Is the crow angle is more than 34.5. So should I need to be worry about this ?
 

flystar168

Rough_Rock
Joined
Mar 13, 2016
Messages
19
flyingpig|1458579029|4008943 said:
http://www.whiteflash.com/a-cut-above-diamonds-specifications-and-qualifications/

The ideal range for crown angle is 34-35. 34.9 is perfectly fine and ASET/IS confirms this.
You have NOTHING to worry about in regards to light performance and proportion numbers, when buying an ACA stone.

Just ensure the stone you want is eye-clean
Thank you very much for your great help
 

Dancing Fire

Super_Ideal_Rock
Premium
Joined
Apr 3, 2004
Messages
31,506
A very nice stone!... ;))
 
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