Clarity is one of the 4Cs of a diamond (cut, color, clarity, and carat). A diamond’s clarity concerns the diamond’s transparency and is determined by the presence or absence of inclusions, both internal and external. The visibility of these inclusions affects the diamond’s visual appearance and is what’s considered when grading a diamond’s clarity. A clarity scale, invented in the 1950s, is used as the universal standard for measuring clarity and uses the following levels: “flawless”; “very very slightly included”; “very slightly included”; “slightly included”; and “included”. The higher the clarity, the rarer the diamond.
