Cut Diamonds are cut in different shapes. Some common terms used to describe the shape or cut of diamonds include pear, oval, brilliant or round, marquise, baguette and emerald. Proportions, table diameter, facet angles and symmetry are some of the major factors in cutting which determine the stone's ability to handle light. Colour Diamonds range in colour, from colourless to shades such as canary yellow, champagne, cognac brown, sky blue and green. This system of colour grading is based on the GIA standards.
Some diamonds are clearer than others.
Flawless is the highest rating in terms of clarity of the stone. There are other grading systems in use. Enquire as to what system is being used. One thing that obviously distinguishes one diamond from another is weight. The colour factor, which also may vary.