https://www.wowdesigneu.com/collection/drops/ 

The model presents some ready-made layout methods that you can use in your projects, as well as individual elements with grout for the convenience of creating your own layouts using bindings. You can remove the grout element from the object (element ID=2) if it is more convenient, or move it deeper or closer to the surface of the tile. There is a choice from a variety of existing colors. You can change both the color of the tile and the color of the grout.

It is recommended to install the Corona version at least 1.5, since the glossiness of materials is adjusted taking into account PBR.

Those who work in a V-Ray version lower than 3.1, be careful, in the materials in the BRDF section there is Microfacet 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