A |
AAA |
Highest Luster;
Less than 5% Inclusions on Surface; All Nacre;
Perfectly Round;Perfectly Matched; |
A/B |
AA+ |
Highest Luster; Less
than 10% Inclusions on Surface; Perfectly Round;
Perfectly Matched; All Nacre; |
B |
AA |
Good
Luster; Less than 15% Inclusions on Surface; All Nacre; Very Round; Excellent Matching; |
C |
A/A+ |
Moderate Luster;
Less than 30% Inclusions on Surface; All
Nacre; Round to Near-round; Good Matching. |
D |
A |
Moderate
to Low Luster; Less than 30% Inclusions on Surface; All
Nacre; Round to Near-round; Moderate Matching. |
