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Contrast or leakage?

it is not a leakage , it is a head ( camera) obscuration. The reason is same as for black arrows in shallow round diamonds .
 
Looks good
 
Serg said:
it is not a leakage , it is a head ( camera) obscuration. The reason is same as for black arrows in shallow round diamonds .
Click to expand...

So no concern or bad because it sounds like it’s bad in a round?
 
Scooba116 said:
So no concern or bad because it sounds like it’s bad in a round?
Click to expand...

There are a good and a bad contrast. "Nail head" is also head obscuration .
Fast black zones visible only by one eye are positive for Brilliancy.
Slow Black zones visible by both eyes simultaneously reduce Brilliancy.
I do not like strong dark zones as in this emerald as in shallow round diamonds. For my opinion a slow dark zone from head obscuration is not more positive than a slow dark zone from leakage. From other side many experts and salespersons promote shallow round diamonds with strong black arrows .
if you like shallow round cuts like this https://cutwise.com/diamond/17144?sp=43

Screenshot 2023-07-30 at 13.34.29.pngScreenshot 2023-07-30 at 13.34.05.png
You would like emerald as in your links.
Most Emerald cuts have either leakage or head obscuration. it is very difficult to avoid both of them in one emerald design. In Emerald you need use right angles for 5-6 facets to avoid static-slow black zones .Even good samples like https://cutwise.com/diamond/43048?sp=43 have leakage and head obscuration .
Screenshot 2023-07-30 at 13.40.25.pngScreenshot 2023-07-30 at 13.40.16.png

The industry need more time to improve emerald cut design.
 
Check the videos to see if they dance when rotated side to side? Ignore the pavilion view you wont see it.
They can look fine face up but if they don't dance they are missing the real magic that makes them awesome.
Im not at my computer to see the details in the video.
 
Serg said:
There are a good and a bad contrast. "Nail head" is also head obscuration .
Fast black zones visible only by one eye are positive for Brilliancy.
Slow Black zones visible by both eyes simultaneously reduce Brilliancy.
I do not like strong dark zones as in this emerald as in shallow round diamonds. For my opinion a slow dark zone from head obscuration is not more positive than a slow dark zone from leakage. From other side many experts and salespersons promote shallow round diamonds with strong black arrows .
if you like shallow round cuts like this https://cutwise.com/diamond/17144?sp=43

Screenshot 2023-07-30 at 13.34.29.pngScreenshot 2023-07-30 at 13.34.05.png
You would like emerald as in your links.
Most Emerald cuts have either leakage or head obscuration. it is very difficult to avoid both of them in one emerald design. In Emerald you need use right angles for 5-6 facets to avoid static-slow black zones .Even good samples like https://cutwise.com/diamond/43048?sp=43 have leakage and head obscuration .
Screenshot 2023-07-30 at 13.40.25.pngScreenshot 2023-07-30 at 13.40.16.png

The industry need more time to improve emerald cut design.
Click to expand...

Excellent review Sergey :-)
 
I need ASET to make any judgement - and draggable videos
 
 
Serg said:
Fast black zones visible only by one eye are positive for Brilliancy.
Click to expand...

This is an important point. :clap:

Thank you for making the distinction between fast black zones visible with only one eye and slow black zones visible with both eyes.

I recently saw a diamond with lots of red and green but no blue zones on ASET.

It returned a lot of white light but lacked the contrast, pop and dispersion that you see when fast black (blue on ASET) zones are present.

Those fast black zones (which become red at slight tilt angles) create a lot of pop and dispersion.
 
 
The ideal for an EC is min. blue in ASET but in video each virtual facet fires by itself.
Multiple red in aset virtual facets firing together in tilt makes it bright and boring.

Red in a well cut EC is not the same as the majority of the red in most RBs.
The majority of red in most RBs is red next to blue where red in a well cut EC is a mix of red next to green and red next to blue.
3 zones does not and can not define EC behavior but aset can give you a very rough idea of the face up potential.
For there you need video rotating side to side to see if the virtual facets fire independently and with reasonable speed.
 
Karl_K said:
The ideal for an EC is min. blue in ASET but in video each virtual facet fires by itself. Multiple red in aset virtual facets firing together in tilt makes it bright and boring. Red in a well cut EC is not the same as the majority of the red in most RBs. The majority of red in most RBs is red next to blue where red in a well cut EC is a mix of red next to green and red next to blue.
3 zones does not and can not define EC behavior but aset can give you a very rough idea of the face up potential.
For there you need video rotating side to side to see if the virtual facets fire independently and with reasonable speed.
Click to expand...
Superb answer Karl - love it.
Scooby think about ASET like this.
A perfect visual is as a individual facet on a rotating diamond in perfection terms flashes Blue to red and then green then back to red then blue then red etc.
Blue to green is I think (???) impossible? Maybe not?
The worse type of situation is when there is a large leakage zone and these are hard to see in videos because most have some amount of light of brightish surfaces behind the diamond.
The WORSTEST is when there are large leakage AND blue side by side as then when the diamond moves you get nothing nothing nothing.
 
Garry H (Cut Nut) said:
The WORSTEST is when there are large leakage AND blue side by side as then when the diamond moves you get nothing nothing nothing.
Click to expand...
Yep I agree.


"Blue to green is I think (???) impossible? Maybe not?"
hmm interesting question, certainly if you move it fast enough it could appear to or in a video where the frames are a couple degrees apart.
I think if you slow it down enough it would show there was a color between them. Not 100% sure but it seems unlikely.
 
Karl_K said:
Yep I agree.


"Blue to green is I think (???) impossible? Maybe not?"
hmm interesting question, certainly if you move it fast enough it could appear to or in a video where the frames are a couple degrees apart.
I think if you slow it down enough it would show there was a color between them. Not 100% sure but it seems unlikely.
Click to expand...

Would you please give me your opinion on this one, Karl? I bought an ASET but I am having a hard time using it. This stone seems really bright and I love the scintillation in the corners, but I’m not sure if the middle is doing enough. As you can tell, I’m also struggling to get decent video of it. I think it looks more lively in person and I couldn’t get that to show on the video.

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https://imgur.com/a/cnWBk8V
 
Scooba116 said:
Would you please give me your opinion on this one, Karl? I bought an ASET but I am having a hard time using it. This stone seems really bright and I love the scintillation in the corners, but I’m not sure if the middle is doing enough. As you can tell, I’m also struggling to get decent video of it. I think it looks more lively in person and I couldn’t get that to show on the video.

Emerald 4.23 Carat Lab Grown Diamond, E, VS2, IGI lg571309043

Buy 4.23 Carat Round Lab Grown Diamond, E Color, VS2 Clarity, IGI lg571309043 from Brilliance. A huge selection of ethical, sustainable, lab-created diamonds.
www.brilliance.com www.brilliance.com
https://imgur.com/a/cnWBk8V
Click to expand...

Your right, large part of the center is flashing all at once and is very slow to flash out of leakage.
 
Karl_K said:
Your right, large part of the center is flashing all at once and is very slow to flash out of leakage.
Click to expand...

Throw it back?
 
vid? ASET?
Based on numbers and who likely cut it, it is not a good start.
 
Karl, how do you know who likely cut it?
 
Ibrakeforpossums said:
Karl, how do you know who likely cut it?
Click to expand...

configuration+numbers
To be more correct without doing more research I could not name them but there is a pattern that points to similar stones all likely cut by the same place..
 
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