clarity grade Q. inclusions in relation to the stone size...

[Dancing Fire]

let say we have a 2 ct stone that''s graded SI1,now imagine if we can magically take the same size inclusions from this 2 ct stone and put it on a 5 ct stone,should/would this 5 ct stone grade VS clarity?

 

[FB.]

I thought that a SI inclusion is always a SI inclusion, no matter what stone it is in.
I can find the VS inclusions much more easily in "her" 1ct stones than in "her" 0.3-0.5ct stones. The larger facets make it easier to see into the heart of the stone.
On the other hand, a single SI inclusion in a 0.3ct would take up a much larger portion of the stone than the same SI inclusion in a 1ct stone. But the 1ct stones often have proportionately more inclusions than the 0.3ct.

 

[denverappraiser]

No. Clarity grading has to do with the size, placement and nature of the inclusion. All of this is relative. To give an extreme example small cloud on the edge of a 2 carater that makes it a VS1 could quite possibly fill the entire stone on a 2 pointer.


GG(GIA) ICGA(AGS) NAJA
Professional Appraisals in Denver

 

[Moh 10]

Great question; I'm looking forward to hearing the answer.

I know when grading color that a 5 carat J will look more yellow than a 1 carat J, so maybe they do allow identical type of inclusions to be larger in a larger stone to get the same clarity grade.

 

[John P]

Date: 7/2/2009 12:13:42 PM
Author: Moh 10
Great question; I''m looking forward to hearing the answer.

I know when grading color that a 5 carat J will look more yellow than a 1 carat J, so maybe they do allow identical type of inclusions to be larger in a larger stone to get the same clarity grade.

Right. As Neil said it''s all relative. A crystal which makes a 50 pointer an SI diamond could very well be a VS inclusion in a larger diamond. Or not...perhaps it would still make it SI, depending on placement & relief (visibility). Every case is judged on its own particulars.

 

[Serg]

Date: 7/2/2009 11:58:43 AM
Author:Dancing Fire
let say we have a 2 ct stone that''s graded SI1,now imagine if we can magically take the same size inclusions from this 2 ct stone and put it on a 5 ct stone,should/would this 5 ct stone grade VS clarity?

some SI2 could come to SI1 if diamond is bigger

VVS does not depend from Diamond size. I depends from Diamond size

so very few SI1 could become VS2 if diamond is bigger ( such shift is smaller for small inclusions )

it is not "Official" LAB version. It is just result my observations and thinking

 

[Rockdiamond]

I agree with Serg. An SI1 sized imperfection in a one carat diamond will be an SI1 in a 10 carat.

Date: 7/2/2009 12:13:42 PM
Author: Moh 10
Great question; I'm looking forward to hearing the answer.

I know when grading color that a 5 carat J will look more yellow than a 1 carat J, so maybe they do allow identical type of inclusions to be larger in a larger stone to get the same clarity grade.

My experience is different Mohs.
How yellow a J looks depends on a lot of factors, but I have not found that size is neccesaily one of them, on it's own.
Taken to a logical conclusion a larger Fancy Yellow would look darker than a smaller one- but again, I don't find that's the case.