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ASET for antique cushion

Aurora26

Rough_Rock
Joined
Apr 24, 2020
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4
Hi all,

I am considering an antique cut cushion and have received this ASET image for the stone. My understanding is that black is light leakage.
So my concerns after seeing this image is that 1) the cross facets are not high performing 2) that the area adjacent to the cross is “mushy”. Are these reasonable conclusions?
Please let me know your thoughts!
1590090015994.jpeg
 
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diagem

Ideal_Rock
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Oct 21, 2004
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4,929
Looks like a modern cushion retouched, Kozibe hiding under big table. This is as far away from antiques as can be..., if Antique (genuine or real) is up your avenue, I suggest looking further..., plenty of options and few selected vendors offering such (decent cuts) today.

BTW, this is Aset white (white = leakage).
 

Karl_K

Ideal_Rock
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In this case black is very deep obstruction or the center of the scope inside the blue area.
This stone could be stunning in a pendant but it will be blah in a ring.
 

Aurora26

Rough_Rock
Joined
Apr 24, 2020
Messages
4
Looks like a modern cushion retouched, Kozibe hiding under big table. This is as far away from antiques as can be..., if Antique (genuine or real) is up your avenue, I suggest looking further..., plenty of options and few selected vendors offering such (decent cuts) today.

BTW, this is Aset white (white = leakage).
1590100255267.jpeg

Here is a normal image of the stone. I tried to understand Kozibe from a brief search but not sure I fully get it. Does this stone have that effect?
 

oldminer

Ideal_Rock
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The black is reflection of the camera's black lens and its surrounding tubing. The diamond may be on a bit of an angle away from the perpendicular to the camera, too. The ASET image is very odd with the black zones. It was taken in an unusual way or possibly touched up.

Who knows? You may love the stone in person, but from what you have, I doubt you can be sure.
 

Aurora26

Rough_Rock
Joined
Apr 24, 2020
Messages
4
In this case black is very deep obstruction or the center of the scope inside the blue area.
This stone could be stunning in a pendant but it will be blah in a ring.
The black is reflection of the camera's black lens and its surrounding tubing. The diamond may be on a bit of an angle away from the perpendicular to the camera, too. The ASET image is very odd with the black zones. It was taken in an unusual way or possibly touched up.

Who knows? You may love the stone in person, but from what you have, I doubt you can be sure.
Thank you both for sharing your knowledge. The image provider came back and responded “The white areas are your main leakage and the black areas are more blocked than anything” and “Black/blue areas are not necessarily a bad thing to see in the image, as long as you do not see them stay that way in the video. The main thing you want to avoid is large areas that do not change whether they are lit up or dark.”

To conclude, now less sure this is a stone I’d want to pursue.
 

Karl_K

Ideal_Rock
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The regular picture gives a pretty good idea based on the ASET what you would see, large dark areas in a ring environment when static. The overall effect is a less bright appearing stone because it is looking for light in areas your blocking it.
At long distances in a pendant they come to life.
 

Aurora26

Rough_Rock
Joined
Apr 24, 2020
Messages
4
The regular picture gives a pretty good idea based on the ASET what you would see, large dark areas in a ring environment when static. The overall effect is a less bright appearing stone because it is looking for light in areas your blocking it.
At long distances in a pendant they come to life.
Could you give a little explanation on what’s going on with the areas where light is “blocked”? As just a commoner, I’m not quite grasping the concept - what would be blocking light from reaching those facets?
 

Garry H (Cut Nut)

Super_Ideal_Rock
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Thank you both for sharing your knowledge. The image provider came back and responded “The white areas are your main leakage and the black areas are more blocked than anything” and “Black/blue areas are not necessarily a bad thing to see in the image, as long as you do not see them stay that way in the video. The main thing you want to avoid is large areas that do not change whether they are lit up or dark.”

To conclude, now less sure this is a stone I’d want to pursue.
The explanation from the vendor is accurate.
Can we see the video?
The Koxibie effect is when you see the culet thru the crown facets. Some love it some do not.
I will slightly disagree that the black (oOld Miner descrbed it correctly) is from dead centre of the viewing position.
It likely turns to red for each eye and is only dark when one eye is closed.
It could be an additive brilliance effect. What we call binocular rivalry.
 

Karl_K

Ideal_Rock
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Could you give a little explanation on what’s going on with the areas where light is “blocked”? As just a commoner, I’m not quite grasping the concept - what would be blocking light from reaching those facets?
You are, when your looking at the stone.
That area of the diamond is looking for light right back at you when your looking at it.
 

Garry H (Cut Nut)

Super_Ideal_Rock
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only place it could come from in the ASET image is dead center in the scope????
I made 2 nailhead diamond videos Karl - one with ASET which has a wide blue section.
1590122963864.png
Another with Gilbertsonscope which has a smaller black zone
1590122998967.png
But no where near as small as the hole that was drilled into this ASET Scope causing a very very small dark zone.

https://youtu.be/Mm2SMhXFgqs

 
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diagem

Ideal_Rock
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1590100255267.jpeg

Here is a normal image of the stone. I tried to understand Kozibe from a brief search but not sure I fully get it. Does this stone have that effect?
Hi, in short, the kozibe effect is when an opened (e.g. polished vs. pointed) culet gets reflected through all or most crown facets when viewed from the top.

I dont know if I am allowed to post a link to an educational I wrote about this subject as its from our website, Andrey feel free to remove if not allowed.
This article explains about the History of the open culet (Kozibe): https://gemconcepts.net/diamond-kozibe/

I attached this image which clearly presents some attributes of antique cuts, you can notice a much taller crown (e.g. girdle to table) which automatically requires larger crown facet surfaces creating a much smaller table.The the diamond in this picture is slightly tilted and show how all the open culet reflections (e.g. kozibe) are capturing light and reflecting back to the viewer.
Kozibe_on.png

Not sure if you like this phenomena as Garry mentioned its not everyone's cup of tea but if you do, the antique cut cushion you posted doesn't possess or reflects such attributes.

Good luck,
 
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