| GIA |
Gemological Institute of America |
| AGL |
American Gemological Laboratories |
| AGTA |
American Gem Trade Association |
| GTC |
Gemological Testing Center |
| EGL |
European Gemological Laboratory |
| AGS |
American Gem Society |
| HRD |
the Diamond High Council of Belgium |
| CIBJO |
International Confederation of Jewelry, Silverware, Diamonds, Pearls and Stones. |
| SSEF |
Swiss Foundation for the Research of Gemstones |
| Scan D.N |
Scandinavian Diamond Nomenclature. |