Humans have been searching, mining and using gemstones for nearly 6000 έτη. Για παράδειγμα, the famous Chinese “Hetian Jade” has been discovered as early as the primitive society. Σύμφωνα με ελλιπή στατιστικά στοιχεία, there are more than 600 kinds of gem mines discovered and mined in the world, and these gem resources are mainly distributed in […]
