| as with other gemstones | 4 | other |
| very | 3 | degree |
| sometimes | 2 | degree |
| opal → be → valuable | 6 |
| opal → be → more valuable | 5 |
| opal → be → the most valuable | 4 |
| negative | neutral | positive |
| 0.085 | 0.214 | 0.701 |
| Raw frequency | 15 |
| Normalized frequency | 0.466 |
| Modifier score | 0.600 |
| Perplexity | 217.676 |