In selecting a diamond, the rarity, value and beauty is determined by the four factors mentioned below, called the 4C's: Carat Weight , Color , Clarity , and Cut (proportions & finish). Today, many consumers are aware of the 4C's, however, understanding how they determine value is important to discover what appeals to you in selecting a diamond, and getting the most for your money.
Carat Weight
Carat weight refers to the size of the diamond. Based on a standard unit of measure, one carat is divided into 100 points. The term originated from carob seeds that were used to balance scales in ancient times.
Color
The most desirable diamonds are colorless because the absence of color enhances the diamond's ability to reflect a rainbow of color. Diamonds are graded on a scale of D (almost clear white) to N-Z.
Clarity
Diamonds can contain slight imperfections. Often invisible to the naked eye, these natural birthmarks fall into two categories-inclusions (internal) and blemishes (external). Fewer inclusions increase the value of the stone.
Cut
Cut gives the diamond its brilliance. Of the four C's, it's the only one dependent on a human touch. Using precise mathematical formulas, the cutter transforms a diamond in the rough into a sparkling jewel that reflects and refracts light.