Preliminary Exam
A 1st identification before stock purchases or stone recutting - Paper letter in A4 format.
Color
| D-E-F+ | F--G | H-I | J-Z | |
| 62.0 % | 38.0 % | 0.0 | 0.0 |
Purity
| Fl-IF | VVS | VS | SI | P |
| 22.0 % | 78.0 % | 0.0 | 0.0 | 0.0 |
Cut
| Excellent | Very good | Good | Fair | Poor |
| 38.0 % | 62.0 % | 0.0 | 0.0 | 0.0 |
Fluorescence
| None | Weak | Medium | Strong | Very strong |
| 40.0 % | 18.0 % | 2.0 % | 0.0 | 0.0 |
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