When was "Vajracharya Priest’s Crown" created?

This artwork was created 13th–early 14th century.

What medium is "Vajracharya Priest’s Crown"?

Vajracharya Priest’s Crown is Gilt-copper alloy inlaid with semiprecious stones, lapis lazuli, and turquoise .

Yes, Vajracharya Priest’s Crown is in the public domain and available for free download under CC0 license.

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Unknown Artist, 13th–early 14th century