How do you properly pick up a diamond with tweezers?

How do you properly pick up a diamond with tweezers?

John Cordova (Vice President of Human Resources, Robbins Bros.) gives expert video advice on: Does it make any difference if I examine a diamond mounted or unmounted?; Should I ask the salesperson to clean the diamond before I view it?; When I examine a diamond should I use my hands or tweezers? and more...