Cut: A diamond´s cut is considered the most important characteristic because it is what gives a diamond its brilliance. The angles and finish of a diamond are what determines its ability to handle light.
Clarity: A diamond’s clarity is determined by the amount and visibility of inclusions (the tiny pinpoints, markings and clouding that can affect a diamond’s overall appearance). The fewer inclusions there are, the higher the diamond’s value.
Color: Natural diamonds have a wide range of colors ranging from completely colorless to slightly yellow, or brown. Generally, the less color a diamond has, the more valuable it is.
Carat: The unit of measurement for a diamond's weight is known as a carat. This is one of the major factors that determine a diamond’s price. The value increases exponentially for higher carat weights.