Pearl Grading
| AAAAA | AAAA | AAA | AA | A | |
| OVERALL |
TOP GRADE Represents 3% annual yield |
VERY HIGH GRADE Represents 7% annual yield |
HIGH GRADE Represents 10 % annual yield |
MEDIUM GRADE Represents 20% annual yield |
COMMERCIAL GRADE Represents 30% annual yield |
| LUSTER | EXCELLENT | VERY HIGH | HIGH | GOOD | MEDIUM |
| SURFACE | 95% BLEMISH FREE SURFACE | 90% BLEMISH FREE SURFACE | 80% BLEMISH FREE SURFACE | 70% BLEMISH FREE SURFACE | 60% OR BETTER BLEMISH FREE SURFACE |
| SHAPE | ALMOST PERFECT ROUND | ROUND | SLIGHTLY OFF ROUND | OFF ROUND | OFF ROUND & NOT ROUND |