Don't forget to enable turbosmooth before rendering
Polys: 79,856Verts: 80 230
The model was made according to references from the Internet.
There are 3 spheres in the scene that have silver, bronze and gold material. Use them to repaint the lamp in the material you need.
The model has been unwrapped.
For Corona render, it is recommended to install a version of at least 1.5, since the glossiness of materials is configured with PBR in mind.