Standard Deviation of AGS, EGL and GIA

[iwannaprettyone]

After looking at http://grading.pricescope.com/appendix-iii.aspx I decided to put all the data into a table to show the deviation of measurements from the result. These differences might affect your HCA score right?

ETA: obviously this is +/- thing hence deviation.

 

[iwannaprettyone]

EX.

If you total depth is 61.2 it would become 61 (60.99) or 61.4....don't little changes matter?

Its fun to play with HCA

 

[Garry H (Cut Nut)]

Interesting pretty1

 

[junior35]

I believe most of the labs are using Sarin (maybe an OGI here and there) for measurements.There are differences between Sarin machines of different types.
There are even differences between Sarin machines of the same type even after proper calibration. I don''t know exactly why,maybe slight differences in optics?

 

[strmrdr]

Date: 7/20/2007 10:00:05 PM
Author: junior35
I believe most of the labs are using Sarin (maybe an OGI here and there) for measurements.There are differences between Sarin machines of different types.
There are even differences between Sarin machines of the same type even after proper calibration. I don''t know exactly why,maybe slight differences in optics?

assuming the top end sarin:
calibration
operator skill
Which lens is used, use the one for large diamonds on small and accuracy suffers.
Which firmware is being used, there has been a large improvement in recent updates over the last 18 months or so.