| Alex Stewart International (India) Pvt Ltd – Odisha |
| Chennai Calibration Centre, Chennai |
| Chennai Mettex lab Private Ltd, Chennai |
| Mettex lab Private Ltd, Erode |
| Emerald Testing (India) Pvt Ltd, Coimbatore |
| Enviros India Pvt Ltd, Thiruvallur |
| MS Gold Hallmarking Centre, Chennai |
| Kesar Assaying & Hallmarking Centre, Chennai |
| Sree Vishnu Assaying & Hallmarking Centre, Chennai |
