Is GIA certified triple excellence for cut, sym, polish same as AGS000?

[mcblohe]

I''ve heard that AGS000 is very good... Just wondering whether the GIA triple excellence for cut, symmetry and polish is the same? If now, what''s the difference?
Thanks

 

[tanalasta]

No.

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!