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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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