GIA stats converted to AGS PGS

[Riesz]

GIA offers free cut grade estimation software to the public on its website.

After reading some GOG articles and other websites I'm curious how my GIA diamond would fare if the stats were converted to AGS light performance critique.

I've been searching online for a free service to grade my diamond with AGS standards but can't find anything. Does something like this exist other than the $1000 dollar professional grade software? I'm hoping they offer a basic website service estimator like GIA does.

This is only to satisfy curiosity so I'm just hoping for a rough estimate based off the angles and info on the GIA cert, not anything as involved as having scans done, etc. I'm a numbers nerd and would love to know what my diamond would rate for AGS light performance

 

[diamondseeker2006]

This pretty much will tell you if the stone would fall into AGS Ideal territory:

https://www.pricescope.com/tools/hca

 

[Riesz]

This pretty much will tell you if the stone would fall into AGS Ideal territory:

https://www.pricescope.com/tools/hca

My stone rates 1.0 with all excellent except for very good spread. Do you know approximately how that would translate to an AGS light performance grade?

 

[c-k]

This pretty much will tell you if the stone would fall into AGS Ideal territory:

https://www.pricescope.com/tools/hca

My stone rates 1.0 with all excellent except for very good spread. Do you know approximately how that would translate to an AGS light performance grade?

Post the GIA lab numbers, the experts may have estimates...I would guess only AGSL lab can give you an exact answer.

 

[Rhino]

It's impossible to know without an actual physical inspection and scan. I've seen diamonds with great HCA scores get AGS 2 & 3 for light performance due solely to azimuth angles or differences in minor facet cutting that were GIA Ex in cut. As with the GIA "estimator" using the numbers on the AGS is at best a guess. Maybe a "good guess" but a guess none the less. Your best bet is to have an appraisal done either by AGS themselves or an appraiser with the AGS PGS license who can perform it.

Best regards,
Rhino

 

[Riesz]

Here are the stats:

6.4x6.43x3.94mm
Depth 61.4%
Table 57%
Crown angle 35.5
Pavilion angle 40.2
Girdle medium-slightly thick

Cert http://imgur.com/mfogI0P.jpg

 

[Riesz]

It's impossible to know without an actual physical inspection and scan. I've seen diamonds with great HCA scores get AGS 2 & 3 for light performance due solely to azimuth angles or differences in minor facet cutting that were GIA Ex in cut. As with the GIA "estimator" using the numbers on the AGS is at best a guess. Maybe a "good guess" but a guess none the less. Your best bet is to have an appraisal done either by AGS themselves or an appraiser with the AGS PGS license who can perform it.

Best regards,
Rhino

Shucks, I was afraid of that. It's simply to satisfy personal curiosity about my engagement ring diamond so I don't think I'd send it off to a lab or anything. I'm a bit disappointed they don't offer some type of basic estimate like GIA does. Oh well

 

[Rhino]

It's impossible to know without an actual physical inspection and scan. I've seen diamonds with great HCA scores get AGS 2 & 3 for light performance due solely to azimuth angles or differences in minor facet cutting that were GIA Ex in cut. As with the GIA "estimator" using the numbers on the AGS is at best a guess. Maybe a "good guess" but a guess none the less. Your best bet is to have an appraisal done either by AGS themselves or an appraiser with the AGS PGS license who can perform it.

Best regards,
Rhino

Shucks, I was afraid of that. It's simply to satisfy personal curiosity about my engagement ring diamond so I don't think I'd send it off to a lab or anything. I'm a bit disappointed they don't offer some type of basic estimate like GIA does. Oh well

I hear ya. The HCA is a decent estimator but it assumes near perfect azimuth angles (which very few diamonds have) and bases it's estimate on the average of only 17 out of 57 facets. The AGS PGS looks at how all 57 facets work in harmony with each other taking into account every last detail of the measurements. IMPO it's a tool every appraiser should have at their fingertips. Good luck and you know what ...your decision has already been made so just enjoy it!

Have a great day.