What is used to cut diamond?
Diamond cutting
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Bruting is the art of cutting a diamond round. In the modern era diamonds are rounded using either a laser; a diamond disk impregnated with diamonds; or two diamonds cutting against each other. Industrial diamonds can also be used for bruting a diamond round. Modern computer software measures the roundness of each diamond and "Ideal Cut" diamonds have to round within a 10th of a millimeter to qualify as an excellent cut diamond.