MENU marble shelf :

https://menuspace.com/collections/storage-shelving/products/plinth-shelf-marble 

each shelf has : H : 10 cm – W: 60 cm – D:12 cm

“Who works with V-Ray version lower than 3.1 pay attention to materials section BRDF (Microfaset GTR (GGX)) if your version is older than 3.1 – this section will be empty and you have to choose: Blinn Ward or Phong d dependence on material “.