A diamond s clarity depends on the number, color, type, size, and position of surface and internal birthmarks. These internal marks are called inclusions. The path of light traveling through the diamond can be hindered by major inclusions affecting its brilliance. These identifying characteristics may or may not be visible to the naked eye. Diamonds without these inclusions are considered internally flawless .
Flawless stones are perfect and desired for their rarity and beauty.
Diamonds that have very, very small inclusions are graded as VVS1 or VVS2. The larger the inclusion, the lower the diamond is graded. Inclusions that can be seen with the naked eye are graded I1 or I3. Simply put, diamonds sparkle more when more light travels through it because they have higher clarity. The color of diamonds is graded using the alphabet system started with the letter D continuing through the alphabet.