About Diamond ClarityNatural diamonds are formed by tremendous heat and pressure deep within the earth. This process can result in imperfections. A diamond’s clarity is determined by the number, size, nature and position of these characteristics. No diamond is perfect, but the closer it comes, the higher its value. Most diamonds have inclusions, so it’s important to check with the naked eye. If a diamond looks clean, purchasing one with a higher clarity grade will only add to the expense – not necessarily the beauty.