All diamonds have identifying characteristics, but most are invisible to the naked eye. To view a diamond, experts use a 10x magnification loupe, which allows them to see the appearance of tiny crystals, feathers, or clouds. These natural phenomena are called “inclusions”. Inclusions are also referred to as internal characteristics of the stone. External characteristics of a stone are referred to as “blemishes”. Blemishes can occur when a diamond is being cut, polished, or set into a mounting. A diamond’s clarity is a measurement of how flawless the stone is. The more flaws a stone may possess, the lower the value and visa versa.