Then take silver and gold: this reiterating the command both confirms and explains the former command. Make crowns; two, the one of silver, the other of gold. Set them, put both of them, i.e. one after the other, upon the head of Joshua, who now in this circumstance stands a type of Christ, King and Priest for ever for his people, and this extraordinary act was to represent something extraordinary in the Messiah.
Related Commentaries of Zechariah 6:11
Zechariah 6:11
11 Then take silver and gold, and make crowns, and set them upon the head of Joshua the son of Josedech, the high priest;