Pearl Grading
| Hanadama | AAA | AA | A | |
| Surface | 98% or cleaner pearl surface with either very minor or no blemish visible | Very minor to no blemishing with at least 95% of the pearl surface clean | Minor blemishing with a 85-95% clean surface | Medium blemishing with a 75-85% clean surface |
| Luster | Very to exceptionally strong | Strong to very strong | Medium | Fair |
| Nacre | Extra thick | Thick | Medium | Thin |
| Shape | Perfectly round （Less than 3.00%） | Perfectly round （Less than 3.00%） | Round （Less than 5.00%） | Near round （Less than 12.00%） |