WF ES gets GIA

[rstillin]

So what gives here? GIA "fair" cut grade??? I happen to find a Stone that looks pretty nice on WF ES, IS image looks nice, Sarin looks good, but looking up the GIA cert the cut grade is listed fair. What penalized the cut grade so much?

 

[Serg]

How did you receive Fair grade?
Is it software grade just?

 

[rstillin]

bottom right of the gia cert. gives cut grade as "fair"

 

[Serg]

Date: 1/29/2006 3:09:51 PM
Author: rstillin
bottom right of the gia cert. gives cut grade as ''fair''

I saw it.

How did you receive Fair grade( this document)?
Is it software grade just or real paper?

 

[rstillin]

The IS image and Sarin Scan are from WF page on the stone. I took the GIA cert # and looked it up on GIA site to get the posted GIA info. I have done nothing but pick the images/info from others on the same stone.

 

[Mara]

That''s kind of wacky, esp since the Proportion Grade on the Sarin is AGS0. The numbers look fine to me, nothing that would push it into only FAIR seemingly. Wonder how accurate the website is?

 

[Serg]

should be software bug

 

[rstillin]

so what would the bug be? all the data in the GIA cert corresponds with the Sarin (depth percentage etc) and WF info. The only thing "wrong" is the cut grade?

 

[strmrdr]

The rounding gives it a knife edge girdle kicking it down is my guess, with the pavilion angle moving from 40.7 to 40.8 the girdle hits .02mm or .3% which is practicaly no girdle at all.

Which you can tell from the sarin and the fact that Brian looked at that isnt the actual case.

It could have also got kicked down for painted girdles... I dont think anyone outside of GIA knows if that would be the case.

 

[Mara]

interestingly enough i ran a stone through the GIA report check just to see what it gave and GIA''s numbers/sarin were different than the WF sarin...the crown angle on the WF was 34.7 and the GIA one was 35. That''s a big variation...

also on the GIA website they had a sample stone and the specs were 58 table, 60.4 depth, 33 crown angle and 41.2 pav and it got an EXCELLENT...personally i would not be interested in a stone like that so it makes me wonder just how valid the cut grades are for people like me who know what area I want my stone to be within.

 

[Lynn B]

Yeah, I agree with Mara. That GIA facetware is just plain *stoooopid* to me! As a certified hair-splitter (CHS)

I do NOT appreciate that "rounding" jazz! Sheesh! I work HARD searching for those exact, specific numbers, thank you very much!!!

 

[JohnQuixote]

Date: 1/29/2006 2:56:46 PM
Author:rstillin
So what gives here? GIA ''fair'' cut grade??? I happen to find a Stone that looks pretty nice on WF ES, IS image looks nice, Sarin looks good, but looking up the GIA cert the cut grade is listed fair. What penalized the cut grade so much?

RStillin - Thanks for spotting this. I''ll copy this over to this thread for discussion. It may be a software bug as Serg alludes, or what Strm identified - a rounding that forces the software to think it has a dangerous girdle.

 

[JohnQuixote]

Ross - I ran the GIA data through Facetware. VG result. Posted it in the thread I linked to above.

 

[Garry H (Cut Nut)]

Date: 1/29/2006 3:08:29 PM
Author: Serg
How did you receive Fair grade?
Is it software grade just?

Sergey you can do a CUT GRADE check on most stones graded by GIA over the past few years here
http://reportcheck.gia.edu/
You need report # and weight only

 

[Dancing Fire]

Date: 1/29/2006 6:03:24 PM
Author: Garry H (Cut Nut)

Date: 1/29/2006 3:08:29 PM
Author: Serg
How did you receive Fair grade?
Is it software grade just?

Sergey you can do a CUT GRADE check on most stones graded by GIA over the past few years here
http://reportcheck.gia.edu/
You need report # and weight only

Garry

how you do a CUT GRADE check?

all it show is the same info as my GIA report,no other specs.

 

[Mara]

DF that means your diamond is too old...it only shows cut grade for the newer stones. I tried it on my Big J too and it did not show me a cut grade but I ran some newer cert stones (from WF) and it showed grades for their more recent reports.

 

[Dancing Fire]

Date: 1/29/2006 7:07:45 PM
Author: Mara
DF that means your diamond is too old...it only shows cut grade for the newer stones. I tried it on my Big J too and it did not show me a cut grade but I ran some newer cert stones (from WF) and it showed grades for their more recent reports.

Mara
oh,i see...my wife''s stone was graded July 2003. i thought GIA has all the specs "SARIN" on file for every stone they graded since 2001.

 

[Garry H (Cut Nut)]

DF if there is enough info they give the grade. But it may be that at the time they did not know exactly how they would grade stones and if yours has an unusual girdle profile for example they may not have issued it a grade.

 

[Dancing Fire]

Date: 1/29/2006 8:55:29 PM
Author: Garry H (Cut Nut)
DF if there is enough info they give the grade. But it may be that at the time they did not know exactly how they would grade stones and if yours has an unusual girdle profile for example they may not have issued it a grade.

Garry
what do mean you by "unusual girdle profile"

the GIA report say...thin-med.

 

[Garry H (Cut Nut)]

like ACA new line or 8*

this is exaggerated

 

[Dancing Fire]

oh.....the ones you call "cheated girdles".

 

[Garry H (Cut Nut)]

Yes DF, tricked = 8* type and cheated = ones that worsen apprearance to gain weight

 

[Serg]

Date: 1/30/2006 2:02:38 PM
Author: Garry H (Cut Nut)
Yes DF, tricked = 8* type and cheated = ones that worsen apprearance to gain weight

re:cheated = ones that worsen apprearance to gain weight

For mask thick gidle. ( It is more correct)

 

[JohnQuixote]

Many terms afloat.

''Digging'' and ''Painting'' are words that are descriptive of approaches used on the wheel.

If the digging or painting was deleterious the girdle was ''cheated,'' to ''mask thick girdle.''
If the digging or painting was additive the girdle was ''tricked'' or ''tweaked.''

Logic would dictate that deleterious brillianteering be penalized, while additive (performance-enhancing) brillianteering would be rewarded (or at least not downgraded).

For more on this subject, here is a thread in the FAQ (that now needs an update) with graphics and info on both digging and painting.