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Pearl Grading System

Freshwater Pearls Grading:

Grading Round Off-round Drop Baroque Button
AAA  luster : Excellent ;  Surface: Little Blemished ; Nacre : Very Thick ; N/A
AA+  luster : Very High ;  Surface: Very Slightly Blemished ; Nacre : Very Thick ;
AA  luster : High ;  Surface: Slightly Blemished ; Nacre : Thick ;

Akoya Pearls Grading:

Grading Round
AAA  luster : Excellent ;  Surface: Little Blemished ; Nacre : Very Thick ;
AA+  luster : Very High ;  Surface: Very Slightly Blemished ; Nacre : Very Thick ;
AA  luster : High ;  Surface: Slightly Blemished ; Nacre : Thick ;

South Sea Pearls Grading:

Grading Round
AAA  luster : Excellent ;  Surface: Little Blemished ; Nacre : Very Thick ;
AA+  luster : Very High ;  Surface: Very Slightly Blemished ; Nacre : Very Thick ;
AA  luster : High ;  Surface: Slightly Blemished ; Nacre : Thick ;

Tahitian Pearls Grading

Grading Round / Cirecle Drop
AAA  luster : Excellent ;  Surface: Little Blemished ; Nacre : Very Thick ;
AA+  luster : Very High ;  Surface: Very Slightly Blemished ; Nacre : Very Thick ;
AA  luster : High ;  Surface: Slightly Blemished ; Nacre : Thick ;