The earliest unearth art can be updates to seven thousands years ago,and official document for lazurite around 403 B.C~221 B.C（during the Warring age ）.
The earliest unearth art can be updates to seven thousands years ago,and official document for lazurite around 403 B.C~221 B.C（during the Warring age ）.
其出土文献，七千年前即有发现而春秋战国及有正式文献记载。