The 4 C's of a Diamond
The quality and value of diamonds are usually measured by the "4 C's" Color, Clarity, Carat weight, Cut.
Carat weight: The weight measurement used for diamond is called "carat". One carat = 200 milligrams. Diamonds are sold by weight not by size.
Color: Refers to the body color of the diamond. The absence of color is most valuable.
Clarity: Refers to the purity of the diamond crystal. Most diamonds will have some inclusions and irregularities in their crystal structure.
Cut: Sometimes called "Make" refers to the 1 Proportions 2 Symmetry 3 Polish Color and Clarity are graded, based on standards and systems widely accepted by the diamond and jewelry trade.
Evaluation of Cut is much more complex. There is no widely recognized cut grading system that can be used to objectively compare diamonds for quality of cut