Bruting is a part of the process of diamond refining. After cleaving or sawing, the corners of the diamond are rounded off (only round brilliant cuts require this step). The stone is cemented into a "lathe", a holder that fits on a turning shaft. Another diamond is cemented to the end of a long rod held under the bruter's arm. As the lathe rotates, the two diamonds are brought together and ground to shape. Diamond dust is produced from this action and is used in further sawing and faceting.