Diamonds are graded by independent gemological laboratories that follow strict guidelines. At Richdiam we've made the concious decision to only work with the Gemological Institute of America (GIA). We do this because they have the strictest grading parameters and are considered the foremost authority in gemology. The GIA grades diamonds according to four main parameters called the four Cs.
The four Cs are Cut, Color, Carat, and Clarity. To learn more about the four Cs and how diamond grading works, go to our article called 'The Four Cs' under the Education section of our website.