Humans have been searching, mining and using gemstones for nearly 6000 ปี. ตัวอย่างเช่น, the famous Chinese “หยกเหอเทียน” has been discovered as early as the primitive society. ตามสถิติที่ไม่สมบูรณ์, there are more than 600 kinds of gem mines discovered and mined in the world, and these gem resources are mainly distributed in […]
