The model is made for smoothing. In the scene on the Turbosmooth modifier there are 0 iterations, when rendering: 1. Pivot at the bottom of the objects, each skewer is grouped and all skewers together are also grouped.

V-Ray version: 3.5. Those who work in a V-Ray version lower than 3.1, be careful, in the materials in the BRDF section there is Microfaset GTR (GGX), if your version is older than 3.1, then the BRDF field will be empty. Choose Blinn, Phong or Ward - whichever is preferable for you.

Corona version: 5. For Corona render, it is recommended to install version no lower than 1.5, since the glossiness of the materials is adjusted taking into account PBR.