Understanding Diamonds is the key to choosing the right Diamond. When selecting a stone remember that its value is based both on its beauty and its rarity. Diamonds are normally graded in four (4)  ways.   These methods are most commonly known as the "Four C's".

CUT   COLOR    CLARITY    CARAT WEIGHT

Below are two diamonds.
They are both considered to be in the 1/2 carat range.
They are within .03ct weight of each other.
They retail within $100.00 of each other.

Learn more about diamonds here.