Diamond purity refers to the absence of inclusions, blemishes, and other imperfections within the stone. Inclusions are foreign particles or crystals trapped within the diamond during its formation, while blemishes are external imperfections such as scratches or chips. The fewer inclusions and blemishes a diamond has, the purer it is considered to be.
Diamond purity is one of the four Cs of diamond grading, along with carat weight, color, and cut. It is an important factor in determining the value of a diamond, as inclusions and blemishes can affect its beauty and durability. A diamond with high clarity will be more valuable than a diamond with many inclusions or blemishes.