Current AGS girdle % definitions

[insured]

I find conflicting information on definitions of current AGS girdle thickness ranges. Anyone have reference for what % translates to?

Eg. girdle 1.9%-4.1% is slightly thin to slightly thick or thin to thick or ??

Thanks!

 

[yssie]

Girdle thickness descriptors per AGS PGS spec (Pg12)
http://www.americangemsociety.org/uploads/AGSPerformanceGradingsoftwareTutorial-707.pdf
From here: http://www.americangemsociety.org/performancegradingso

AGS proportions grading info (200
http://www.agslab.com/docs/pbcg/CompleteInstructionsfortheAGSLProportionBasedCutGrade.pdf

Examples of indexing - Peter Yantzer (2005):
http://www.agslab.com/members/content/docs/The_Effects_of_Indexed_Upper_Half_Facets.pdf

 

[insured]

Thanks once again Yssie!