DIamond grading system and comparable charts between russian and USA gradings

[bf747]

Hello,

I am interested in getting information and comparable charts in diamond grading system between USA and Russian grading systems.
I have heard in russia they measure and grade the diamond quality and colors in different ways and would like to know how to compare GIA grading. for example
what is the equivalent of SI-GH to russian grading system or VS-GH.

Thank you very much for your help.

 

[Garry H (Cut Nut)]

http://www.gemology.ru/3dbook/3dbook_eng.htm
buy this.
read this http://www.gemology.ru/cut/english/symmetry/
and this http://www.gemology.ru/3dbook/eng/crypted/5.htm