Ruby Stone
| Business category 1 | Metal Processing Service |
| City ( of main office ) | Hà Nội, VN, Vietnam |
| Address | Ba Dinh - Ha Noi - Viet Nam |
| Phones | 84-4-7628261 |
| Fax | 84-4-7628261 |
| Web site | khoaninh.com |
| About | Regarding industrial minerals, some precious stone mines in theLuc Yen and Yen Binh districts existed more than one million years ago with a great ruby reserve. Many precious gems have been found in the Yen Bai province and are considered as the national heritage of Viet Nam. |
| Date | 2011 Oct 29, 00:10 |