computerguy
Rough_Rock
- Joined
- Jan 27, 2004
- Messages
- 30
I''m trying to read more about the AGS cut grade of "0" (zero). If you go to a few web sites, you will read about the AGS cut grade 0 will have certain crown angles, pavilion angles, etc.
The values quoted are different for different web sites! Take a look at this site:
http://www.diamondgrading.com/Articles_GIA_vs_AGS_CUT.htm
compared to this site:
http://www.niceice.com/ogi/
The values for Table Diameter are different! What''s the deal?
I noticed at the http://www.niceice.com/ogi/ web page, it says that there was a revision to the AGS spec in Q1 2003. Can someone confirm this info?
The quotation is shown below. (I hope I''m not violating any sort of copyright law by doing this cut and paste. If this is illegal, I''ll edit the post and remove the text.)
RWW
The proportions chart located right beneath this section provides the parameters for the proportions scale developed by the AGS Laboratory:
(Chart removed).
Please note however that the chart above uses the pavilion depth percent as a determining factor of the proportions rating and that during the first quarter of 2003 the AGS eliminated the percent variables from their proportions scale because of a realization that the angle measurements are more accurate than the estimated percentages... The range for the pavilion angle measurement for the AGS Ideal 0 proportions grade ranges from 40.15 to 41.20 degrees. While both Sarin and OGI have been made aware of the change of parameters for the AGS zero ideal cut rating, the program software has not been updated yet to reflect the change and thus some diamonds that would score "zero" on the current AGS proportions scale are reflecting lower scores...
The values quoted are different for different web sites! Take a look at this site:
http://www.diamondgrading.com/Articles_GIA_vs_AGS_CUT.htm
compared to this site:
http://www.niceice.com/ogi/
The values for Table Diameter are different! What''s the deal?
I noticed at the http://www.niceice.com/ogi/ web page, it says that there was a revision to the AGS spec in Q1 2003. Can someone confirm this info?
The quotation is shown below. (I hope I''m not violating any sort of copyright law by doing this cut and paste. If this is illegal, I''ll edit the post and remove the text.)
RWW
The proportions chart located right beneath this section provides the parameters for the proportions scale developed by the AGS Laboratory:
(Chart removed).
Please note however that the chart above uses the pavilion depth percent as a determining factor of the proportions rating and that during the first quarter of 2003 the AGS eliminated the percent variables from their proportions scale because of a realization that the angle measurements are more accurate than the estimated percentages... The range for the pavilion angle measurement for the AGS Ideal 0 proportions grade ranges from 40.15 to 41.20 degrees. While both Sarin and OGI have been made aware of the change of parameters for the AGS zero ideal cut rating, the program software has not been updated yet to reflect the change and thus some diamonds that would score "zero" on the current AGS proportions scale are reflecting lower scores...