The cut of a diamond, also referred to as the "make", is one of the four integral parts that establishes a diamond's value. It takes the skill of a master craftsman to yield the best diamond from the rough. The ideal proportions will allow light to enter through the crown, strike the pavilion facet, reflect and refract through the crown into the observer's eye. When a diamond is cut too shallow, the light does not reflect to its optimum, causing light leakage from the bottom of the pavilion. When a diamond is cut too deeply, the light reflects around inside the diamond and escapes through the sides of the pavilion, depriving the diamond of its sparkle. A diamond that is well cut, dances with brilliance and shows the fire for which the gem is renowned.