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Diamcalc anyone? GIA specs different than Sarin!

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diamondpug

Rough_Rock
Joined
Dec 7, 2006
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37
The specs are a little different between the report summaries. Attached are the GIA measurements and the Sarin summary (no additional detail). What does the GIA mean when it says "Profile not to actual proportions"?? I thought that was the point of the diagram!

GIA pic:

thanks!!
Pugsy

giacertspecs.jpg
 

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JulieN

Super_Ideal_Rock
Premium
Joined
Jul 25, 2005
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13,321
Looks fine to me. Systematic error.

Can''t Diamcalc the right one without more info. More info would make it useless?

GIA rounds crown, pavilion, minor facets all to the same precision as the measured value but in increments of .5 degrees or 5% so the diagram is not to the actual proportions.
 

diamondpug

Rough_Rock
Joined
Dec 7, 2006
Messages
37
Thanks! What additional info is needed?

I think I understand the GIA cert comment -- they are referring to the outline drawing, not the numbers that are on there. However, thanks for the 411 about the tolerances on their numbers!

Pugsy
 

diamondpug

Rough_Rock
Joined
Dec 7, 2006
Messages
37
Yes, that is the one. Assuming the idealscope was used correctly, does such a picture take precedence over diamcalc estimations or are both truly needed to be much more confident about optical performance? Or people use diamcalc when they don''t have an idealscope pic?

thx again!!

Pugsy
 

strmrdr

Super_Ideal_Rock
Joined
Nov 1, 2003
Messages
23,295
Not enough info to run diamcalc.
Either set of numbers works.
 

strmrdr

Super_Ideal_Rock
Joined
Nov 1, 2003
Messages
23,295
Date: 12/8/2006 10:38:03 AM
Author: diamondpug
Yes, that is the one. Assuming the idealscope was used correctly, does such a picture take precedence over diamcalc estimations or are both truly needed to be much more confident about optical performance? Or people use diamcalc when they don''t have an idealscope pic?

thx again!!

Pugsy
actual wins.
The only way DC comes close is if a helium scanner is used to measure the diamond and all the data is transfered to diamcalc by importing it directly.
 

belle

Super_Ideal_Rock
Joined
Nov 19, 2004
Messages
10,285
Date: 12/8/2006 10:38:03 AM
Author: diamondpug
Yes, that is the one. Assuming the idealscope was used correctly, does such a picture take precedence over diamcalc estimations or are both truly needed to be much more confident about optical performance? Or people use diamcalc when they don''t have an idealscope pic?

thx again!!

Pugsy
yes, an idealscope takes precedence because it is an actual picture of the diamond. diamcalc assumes perfect optical symmetry, which is not always the case. you would have to have at least a 3d sarin of the diamond but preferably a helium scan for diamcalc to come close to the accuracy of an actual idealscope image.
 
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