The cut and polish of a diamond is the most important of the 4c's. When a diamond is cut with precision and a focus on correct facet placement, it will maximize the diamonds brilliance, scintillation and fire.
Like people, every diamond is individual and unique. One way diamonds are different from each other, is the minute traces of crystals that may get trapped during the crystallization phase of a diamonds growth. These minute crystals are called inclusions.
Though the majority of diamonds appear to be colorless, they are not. There are many shades differences although subtle. Diamonds with no color or very close to no color is considered very rare and valuable.