Clouds. Again. Does the IS/ASET show loss of brilliance due to clouds?

[yssie]

Yet another clouds question - there's been a crop of them lately.


We say beware clouds in SIs (or rather, more conservatively, have them checked by a pro).


I understand how the IS/ASET works.


Q - Regular ol' 57facet RB. Will the IS show this loss of brilliance due to patches of clouds (assuming they're dense enough to actually impact performance IRL) - perhaps, as pale regions, or something? Or is it too blunt for this? We've seen that it does show lack of light return at the sites of some other inclusions - crystals, wisps, feathers..

 

[Paul-Antwerp]

I must say that I have insufficient experience with clouds reducing brightness, so I might not be the best person to answer your question.

Theoretically, you might be correct in your feeling that the IS or ASET might reveal reduced brightness, but I wonder if this can be assessed correctly.

Considering that each vendor''s setup for these pictures varies, that very often pictures are oversaturated, and that most vendors produce these pictures under time-pressure, I think that the theoretical possibility of deducing this will not be possible in practice.

It remains a fact that the online-assessment of diamonds has its limitations, and the judgment of such clouds is a clear example where real-life-observation is necessary.

Live long,

 

[JogiaDiamonds]

Date: 2/25/2010 6:39:23 AM
Author: Paul-Antwerp
time-pressure

Not forgetting the labs, the biggest marker/red flags for me is that they state "Additional clouds not shown" which should require further investigation.

BTW, I've never seen the IS or ASET reveal anything about the transparency of a stone. That is why photos are required. EDIT: with respect to clouds.

 

[Laila619]

I was told they are only a worry if the report says 'The clarity grade of this diamond is based on clouds not shown.'

'Additional clouds not shown' is generally ok.

In any case, I don't think a cloud would show up as less saturated color on an ASET or IS. That's why they're tricky to judge.

 

[Lorelei]

Date: 2/25/2010 6:39:23 AM
Author: Paul-Antwerp
I must say that I have insufficient experience with clouds reducing brightness, so I might not be the best person to answer your question.

Theoretically, you might be correct in your feeling that the IS or ASET might reveal reduced brightness, but I wonder if this can be assessed correctly.

Considering that each vendor''s setup for these pictures varies, that very often pictures are oversaturated, and that most vendors produce these pictures under time-pressure, I think that the theoretical possibility of deducing this will not be possible in practice.

It remains a fact that the online-assessment of diamonds has its limitations, and the judgment of such clouds is a clear example where real-life-observation is necessary.

Live long,

Ditto, I don''t think this is something consumers can judge online or even from images, I think it has to come from a skilled vendor that has the stone in hand.

 

[Rhino]

Impossible to tell from reflectors like ASET/IS/DxRay etc. There are also more issues beyond clouds that can impact transparency that can''t be assessed online.

 

[yssie]

And the value of having a trustworthy vendor is once more obvious.



I didn''t even think of the different photography techniques

 

[Laila619]

Date: 2/25/2010 11:28:50 AM
Author: Rhino
Impossible to tell from reflectors like ASET/IS/DxRay etc. There are also more issues beyond clouds that can impact transparency that can''t be assessed online.

Hi Rhino,

Can you please explain these other issues? Thanks.