The clarity of a diamond refers to the presence or absence of internal and external characteristics in the stone. These characteristics, also known as inclusions and blemishes, can affect a diamond’s overall visual appearance and value. The higher the clarity grade of a diamond, the fewer visible inclusions and blemishes it has. Gemologists use a microscope and a 10x loupe to determine the clarity grade of a diamond.

A diamond’s clarity characteristics can also tell a story about how the diamond was formed.