Fiero zen cut vessel sink is made of polished lobster red travertine stone. This travertine vessel sink is essentially hand carved. However, the help of some modern tools like small diamond saws and handheld polishing tools have been employed. Because it is hand carved, you can expect small variations in the size and shape of the Fiero sink. Generally, a size allowance of a quarter of an -Inch to an -Inch is given.