Professionally done - first of all you need to repair the concrete below, otherwise your new tiles will crack again. If you want to do a DIY repair, you can try using gray colour silicone. Or if you are confident that there is little movement, use grout with a little gray colouring to as to blend with the tiles.
Just discovered this forum and thought I share my experience with "Moss Living". I believe the owner Sunil Sabani has changed the name of the store and now operating out of Defu. I ordered several pieces of mahogany furniture from them. My sofa fell apart after one year and what I found inside was poor quality light wood, not even of standard sizing, also found a joint re-enforced with plastic string. A couple of other pieces had worms burrowing through. Contacted the owner but he refused to make good.