Symmetry and Polish are fairly comparable but the ''cut'' grading issued by the AGS and GIA are somewhat different. A GIA excellent may not necessarily be a AGS0 (and vice versa although this is more unlikely). The GIA cut grading system is quite controversial on PS and a search of the forums can provide quite a lot of information as to why! As do the articles in the reviews section/diamond journal section.
The basic gist is that The AGS and GIA grade their diamonds using different methodology and criteria.
However, if you have a GIA triple excellent with a nice IS then you''re doing very well!
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