Clarity impact on brilliance?

[chloball]

Hi again. So we are thinking of an SI1 stone that has 2 obvious to me feathers when using a loop. The stone comes out very good using your cut advisor.... It seems to me that wouldn''t really be accurate if there are feathers in the way... Am I correct? They are not in the table (on the side. Twinning wisps, Feather and a natural are the symbols on the GIA report. Any opinion is appreciated. Thanks!

 

[Lorelei]

Date: 9/15/2008 6:46:38 AM
Author:chloball
Hi again. So we are thinking of an SI1 stone that has 2 obvious to me feathers when using a loop. The stone comes out very good using your cut advisor.... It seems to me that wouldn't really be accurate if there are feathers in the way... Am I correct? They are not in the table (on the side. Twinning wisps, Feather and a natural are the symbols on the GIA report. Any opinion is appreciated. Thanks!

It is unlikely that SI1 graded feathers would interfere with brilliance - if the grade setter was a cloud or clouds, then it might possibly, but an expert vendor will be able to advise if this is the case. Your vendor can describe this diamond's ' eyecleanliness' or lack of on request if it is an in house stone.

ETA - I reread you must have seen the diamond, if you are concerned make the sale final on a favourable report from an independant appraiser -see here on how to find one in your area. https://www.pricescope.com/appr_list.aspx

Also check the diamond out in more natural lighting away from the store lights, then you will get a better idea for how this diamond will look when worn.

 

[Garry H (Cut Nut)]

Date: 9/15/2008 6:46:38 AM
Author:chloball
Hi again. So we are thinking of an SI1 stone that has 2 obvious to me feathers when using a loop. if the feathers are obvious than as Lorelei says, it will not have inclusions large enough to make a visual difference - it is SI diamonds that appear loupe clean to non expert viewers, but have coulds of microscopic inclusions that you should worry about. Yours seems to be an honest SI1. The stone comes out very good using your cut advisor.... It seems to me that wouldn''t really be accurate if there are feathers in the way... Am I correct? "our" HCA would get it wrong if the diamond was black, or had Fred Cuellar symmetry, or was not polished - I am not psychic (although many think i am psychotic) They are not in the table (on the side. Twinning wisps, Feather and a natural are the symbols on the GIA report. Any opinion is appreciated. Thanks!

 

[Lorelei]

Date: 9/15/2008 8:57:54 AM
Author: Garry H (Cut Nut)

Date: 9/15/2008 6:46:38 AM
Author:chloball
Hi again. So we are thinking of an SI1 stone that has 2 obvious to me feathers when using a loop. if the feathers are obvious than as Lorelei says, it will not have inclusions large enough to make a visual difference - it is SI diamonds that appear loupe clean to non expert viewers, but have coulds of microscopic inclusions that you should worry about. Yours seems to be an honest SI1. The stone comes out very good using your cut advisor.... It seems to me that wouldn''t really be accurate if there are feathers in the way... Am I correct? ''our'' HCA would get it wrong if the diamond was black, or had Fred Cuellar symmetry, or was not polished - I am not psychic (although many think i am psychotic)They are not in the table (on the side. Twinning wisps, Feather and a natural are the symbols on the GIA report. Any opinion is appreciated. Thanks!

LOL!!!

 

[oldminer]

The key word which needs defining is "difference". An engineer likely would say that inclusions do change the amount of light return while an artist would likely say their eyes don't see a difference so nothing happens with eye clean inclusions typical of SI1.

Inclusions do count in accurately measured light return but don't matter much to folks who just want to use their eyes as the sole tool.

When people are asked to pay a premium price for a diamond with "special attributes" such as fine clarity, fine color or fine cut quality, they must pay for what their eyes truly cannot see. If you don't care about these attributes enough to pay the highest range of premium for these special characteristics, then the definition of 'difference" will be the simple version. If you are paying for the top end of these attributes, then you want to have the technical measurements bear out the added value you are being asked to pay.