Gold ornament inlaid with semiprecious stones. Looks like this is an openwork gold part set on the bronze base. 3rd century, from China.
diameter 4.8 cm
The Met collection >> https://metmuseum.org/art/collection/search/49440?searchField=All&sortBy=Relevance&when=A.D.+1-500&ft=*&offset=40&rpp=20&pos=43