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What is an XXX stone?

neuman101

Rough_Rock
Joined
Sep 9, 2011
Messages
18
I put in a pricescope request for diamond info. A representative from ERD wrote back and asked me if I would consider XXX stones with a GIA certificate. What are XXX stones? Thanks for the info.
 

rubybeth

Ideal_Rock
Joined
Nov 12, 2007
Messages
2,568
I think they mean a GIA triple excellent, like an AGS triple 0. GIA uses 'excellent' while AGS uses a numerical system with 0 being the best.
 

Stone-cold11

Super_Ideal_Rock
Joined
Sep 9, 2008
Messages
14,069
Triple excellent grade in cut, polish and symmetry. Polish and symm, VG and better is hard to distinguish by the laymen without equipment. GIA cut grade is a little iffy, I would add another criteria and that is Ex cut with a Holloway Cut adviser score below 2.

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