*淨度等級的劃分均以十倍放大觀察為標準
為 I3 到 FL,英文是 Imperfect 3 至 Flawless:
以下是 GIA 標准:
| FL | Flawless | 完美無瑕 |
| IF | Internally Flawless | 只能看到極小表面特徵內涵物 (肉眼不可見) |
| VVS1 | Very very slightly included | 有非常極小內涵物,極難看到 (肉眼不可見) |
| VVS2 | Very very slightly included | 有非常極小內涵物,難看到 (肉眼不可見) |
| VS1 | Very slightly included | 有極小內涵物,極難看到 (肉眼不可見) |
| VS2 | Very slightly included | 有極小內涵物,難看到 (肉眼不可見) |
| SI1 | Slightly included | 有小內涵物,極難看到 (肉眼不可見) |
| SI2 | Slightly included | 有小內涵物,難看到 (肉眼不可見) |
| I1 | Imperfect | 有內涵物 (肉眼可見) |
| I2 | Imperfect | 有內涵物 (肉眼可見) |
| I3 | Imperfect | 有內涵物 (肉眼可見) |