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Pearl Grading System

Freshwater Pearls Grading:

Grading Round Off-round Drop Baroque Button
AAA  luster : Excellent ;
 Blemish : 98% - 100% Free ;
 Smoothness : Very Good ;
 Nacre : Very Thick ; 		N/A
AA+  luster : Very Good ;
 Blemish : 95% - 98% Free ;
 Smoothness : Very Good ;
 Nacre : Very Thick ;
AA  luster : Good ;
 Blemish : 90% - 95% Free ;
 Smoothness : Good ;
 Nacre : Very Thick ;
A+  luster : Good ;
 Blemish : 85% - 90% Free ;
 Smoothness : Good ;
 Nacre : Very Thick ;
A  luster : Moderate ;
 Blemish : 80% - 85% Free ;
 Smoothness : Moderate ;
 Nacre : Thick ;


Akoya Pearls Grading:

Grading Round
AAA  luster : Excellent ;  Blemish : 95% - 99% Free ;  Smoothness : Very Good ;
 Nacre : Thick ;
AA+  luster : Very Good ;  Blemish : 90% - 95% Free ;  Smoothness : Very Good ;
 Nacre : Thick ;
AA  luster : Good ;  Blemish : 80% - 90% Free ;  Smoothness : Good ;
 Nacre : Moderate to Thick ;
A+  luster : Moderate ;  Blemish : 70% - 80% Free ;  Smoothness : Good ;
 Nacre : Moderate ;
A  luster : Low to Moderate ; Blemish : 60% - 70% Free ;  Smoothness : Moderate ;
 Nacre : Light ;


South Sea Pearls Grading:

Grading Round
AAA  luster : Excellent ;  Blemish : 98% - 100% Free ;  Smoothness : Very Good ;
 Nacre : Very Thick ;
AA+  luster : Excellent ;  Blemish : 95% - 98% Free ;  Smoothness : Very Good ;
 Nacre : Very Thick ;
AA  luster : Good ;  Blemish : 90% - 95% Free ;  Smoothness : Good ;
 Nacre : Thick ;
A+  luster : Moderate to Good ;  Blemish : 85% - 90% Free ;  Smoothness : Good ;
 Nacre : Moderate to Thick ;
A  luster : Moderate ; Blemish : 80% - 85% Free ;  Smoothness : Moderate ;
 Nacre : Moderate ;


Tahitian Pearls Grading:

Grading Round / Cirecle Drop
AAA  luster : Excellent ;  Blemish : 98% - 100% Free ;  Smoothness : Very Good ;
 Nacre : Very Thick ;
AA+  luster : Excellent ;  Blemish : 95% - 98% Free ;  Smoothness : Very Good ;
 Nacre : Very Thick ;
AA  luster : Good ;  Blemish : 90% - 95% Free ;  Smoothness : Good ;
 Nacre : Thick ;
A+  luster : Moderate to Good ;  Blemish : 85% - 90% Free ;  Smoothness : Good ;
 Nacre : Moderate to Thick ;
A  luster : Moderate ; Blemish : 80% - 85% Free ;  Smoothness : Moderate ;
 Nacre : Moderate ;


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