What did King Xerxes set on Esther's head when he made her queen in place of Vashti?

Answer: The royal crown

The king loved Esther more than all the other women, so he set the royal crown on her head and made her queen in place of Vashti.

“And the king loved Esther more than all the other women, and she found grace and favor in his sight more than all of the other virgins. So he placed the royal crown upon her head and made her queen in place of Vashti.”— Esther 2:17 (BSB)