Find your diamond
Find your jewelry
shape
carat
color
clarity

Brown facets in RB?

Status
Not open for further replies. Please create a new topic or request for this thread to be opened.

Bunnifer

Shiny_Rock
Joined
Sep 26, 2006
Messages
227
Can anyone describe what the brown stuff is on the facets? I can only describe it as if the diamond were rubbed in dirt and then wiped off...



Here is the link to the diamond...
http://www.jamesallen.com/diamond.asp?b=16&a=12&c=77&cid=131&item=945305

RE534PIC.JPG
 

kenny

Super_Ideal_Rock
Premium
Joined
Apr 30, 2005
Messages
27,073
If AGS gave it an H the overall color could not be this brown.

Must be the white balance in their camera is not set correctly, or some other step in the photo/electronic process.

Are you refering to the overall color or the dark shadow outlinine some of the brighter facets?
 

Bunnifer

Shiny_Rock
Joined
Sep 26, 2006
Messages
227
I didn''t think it should be this brown either since it is an H. But I couldn''t help wondering...


You''re probably right, Kenny -- it''s probably the camera and not the diamond.
 

DBM

Shiny_Rock
Joined
Oct 24, 2006
Messages
404
there''s just a glitch with the pic. you can even see that the inner "star design" is whiter than the outer, like two different pics.
 

Bunnifer

Shiny_Rock
Joined
Sep 26, 2006
Messages
227
Date: 11/28/2006 11:50:34 AM
Author: kenny
If AGS gave it an H the overall color could not be this brown.


Must be the white balance in their camera is not set correctly, or some other step in the photo/electronic process.


Are you refering to the overall color or the dark shadow outlinine some of the brighter facets?
I''m referring to the dark shadow outlining some of the brigher facets. I found a couple of diamonds on the JA website which also exibit this characteristic.

So, this doesn''t have anything to do with the color/clarity of the diamond but is more of a photographic issue? Nevertheless, I think it makes the diamonds look bad...


5001263PIC.JPG
 

oldminer

Ideal_Rock
Trade
Joined
Sep 3, 2000
Messages
6,327
The "brown" is a reflection of either the lens of the camera or the long hair of the photographer (brown hair). I doubt it is anything but an artifact of the image, not in the diamond.
 

Cehrabehra

Super_Ideal_Rock
Joined
Jun 29, 2006
Messages
11,071
Date: 12/5/2006 4:10:13 PM
Author: Bunnifer

Date: 11/28/2006 11:50:34 AM
Author: kenny
If AGS gave it an H the overall color could not be this brown.


Must be the white balance in their camera is not set correctly, or some other step in the photo/electronic process.


Are you refering to the overall color or the dark shadow outlinine some of the brighter facets?
I''m referring to the dark shadow outlining some of the brigher facets. I found a couple of diamonds on the JA website which also exibit this characteristic.

So, this doesn''t have anything to do with the color/clarity of the diamond but is more of a photographic issue? Nevertheless, I think it makes the diamonds look bad...
I DON''T oop think it is the camera OR the color/clarity - I suspect it is a bit of something like a kozibe effect... sort of... it''s not replicating the culet in the crown facets, but it is reflecting one of the dark shadows from the camera.... I don''t know how to explain it, but I think it''s reflecting shadows from the camera.
 

Cehrabehra

Super_Ideal_Rock
Joined
Jun 29, 2006
Messages
11,071
Date: 12/5/2006 4:14:45 PM
Author: oldminer
The ''brown'' is a reflection of either the lens of the camera or the long hair of the photographer (brown hair). I doubt it is anything but an artifact of the image, not in the diamond.
ha! hehe.... but do you think it could be an indication of a poor cut if it''s reflecting part of the "arrows" up there like that?
 

CaptAubrey

Brilliant_Rock
Joined
Mar 28, 2004
Messages
863
I agree with Dave--the diamond is picking up brown from something brown-colored in the vicinity.

Brown is not a spectral color and so could not be created by the light being refracted around the stone.
 

Garry H (Cut Nut)

Super_Ideal_Rock
Trade
Joined
Aug 15, 2000
Messages
14,655
I too agree.

I have spent some time modelling this diamond with ray tracing and it seems likely that the leakage is going directly behind the stone as in this image.

There is also a 2nd unlikely possability - sometimes light from certain directions bounces around inside a stone until it completely disapates -this is one of the tricks the colored diamond cutters aim for - it exaggerates the color of the diamond and reduces the brilliance and contrast - all aims or a colored cutter.

brown leakage.JPG
 

Garry H (Cut Nut)

Super_Ideal_Rock
Trade
Joined
Aug 15, 2000
Messages
14,655
The 2nd unlikely possability I mentioned above - sometimes light from certain directions bounces around inside a stone until it completely disapates -this is one of the tricks the colored diamond cutters aim for - it exaggerates the color of the diamond and reduces the brilliance and contrast - all aims or a colored cutter.

brown never escaping.JPG
 

Bunnifer

Shiny_Rock
Joined
Sep 26, 2006
Messages
227
Date: 12/5/2006 6:29:22 PM
Author: Garry H (Cut Nut)
I too agree.


I have spent some time modelling this diamond with ray tracing and it seems likely that the leakage is going directly behind the stone as in this image.


There is also a 2nd unlikely possability - sometimes light from certain directions bounces around inside a stone until it completely disapates -this is one of the tricks the colored diamond cutters aim for - it exaggerates the color of the diamond and reduces the brilliance and contrast - all aims or a colored cutter.
Interesting...the AGS cert says that this is an AGS000 diamond...should there be leakage like this in an AGS000?
 

JulieN

Super_Ideal_Rock
Premium
Joined
Jul 25, 2005
Messages
13,321
Date: 12/5/2006 10:10:35 PM
Author: Bunnifer

Interesting...the AGS cert says that this is an AGS000 diamond...should there be leakage like this in an AGS000?
It's fine. The brown places aren't where the "problem" leakage occurs.
 

Garry H (Cut Nut)

Super_Ideal_Rock
Trade
Joined
Aug 15, 2000
Messages
14,655
Date: 12/5/2006 10:10:35 PM
Author: Bunnifer


Interesting...the AGS cert says that this is an AGS000 diamond...should there be leakage like this in an AGS000?
all diamond have leakage.
For example one method aGS use has a result of 12.9% leakage for an AGS 0 stone. But this is not an absolute number - it is an indication only.

When we look at the star in the center of a Tolkowsky diamond like the stone pictured above - about 17% of the light falling on the diamond is reflected off the surface and 67$ refracted back out the top = 84% returned and 16% lost to leakage.
 

Bunnifer

Shiny_Rock
Joined
Sep 26, 2006
Messages
227
Date: 12/5/2006 11:09:52 PM
Author: Garry H (Cut Nut)
Date: 12/5/2006 10:10:35 PM

all diamond have leakage.

For example one method aGS use has a result of 12.9% leakage for an AGS 0 stone. But this is not an absolute number - it is an indication only.


When we look at the star in the center of a Tolkowsky diamond like the stone pictured above - about 17% of the light falling on the diamond is reflected off the surface and 67$ refracted back out the top = 84% returned and 16% lost to leakage.
Oh, OK. So, just out of curiosity, would it be accurate to say that a well-cut diamond depends on percentage of light leakage? If so, would it be accurate to say that the less light leakage, the better the cut?
 
Status
Not open for further replies. Please create a new topic or request for this thread to be opened.
Be a part of the community It's free, join today!

Need Something Special?

Get a quote from multiple trusted and vetted jewelers.

Holloway Cut Advisor



Diamond Eye Candy

Click to view full-size image.
Top