| COMPANY NAME | CONTACT PERSON | CONTACT NUMBER |
| NAN YANG GEMOLOGICAL INSTITUTE | Zeng | 90683118 |
| SINGAPORE GEMOLOGY AUTHORITY | Walter Tan | 97979101 |
| GEMRIGHT GEMOLOGY PTE LTD | Wei Hong | 92487558 |
| COMPANY NAME | CONTACT PERSON | CONTACT NUMBER |
| NAN YANG GEMOLOGICAL INSTITUTE | Zeng | 90683118 |
| SINGAPORE GEMOLOGY AUTHORITY | Walter Tan | 97979101 |
| GEMRIGHT GEMOLOGY PTE LTD | Wei Hong | 92487558 |