What are the 'Four C's' of a diamond?

What are the 'Four C's' of a diamond?

John Cordova (Vice President of Human Resources, Robbins Bros.) gives expert video advice on: What is a diamond?; Why are diamonds so special?; What's the best advice for a couple buying an engagement ring? and more...

The ‘Four C's' of a diamond are cut, color, clarity, and carat weight, and together these ‘Four C's' determine the value of a diamond.