"What's wrong with the shape?

Looks like some accidental positive displacement making a raised ring at the tile taper to joint. It's ugly! I'd use your talents on marble or one color ceramic. ;) Btw, you've not mentioned sss in tile but I'm sure there is tons of it.

 

Also judging from the large size of the taper at the tile edge, it makes the tile small. Say, 2 inches like a shower tile rather than a floor tile of 12 to 30 inches. trivia  but important