The FOUR Cs
The terminology for diamond grading was largely created by the GIA. There are many places online that will explain these terms according to the current orthodoxy in the diamond business. I would like to give you the benefit of my explanation, which is gleaned from 43 years of buying and selling diamonds. I hope my layman’s explanation will help. If you have questions, please feel free to call us at the store. What follows is my perception and interpretation of grading terms.