The final clarity grade is usually determined by how easy the inclusions and blemishes are for the grader to see. Colour Ideally, a diamond should have no colour at all, like a drop of spring water. Diamonds of known colour are used as comparison stones for colour grading. We use the following scale to grade a stone on it's overall appearance. Simply put, when looking at a diamond, if it doesn't catch your eye or if it doesn't flash in the light, it's probably not well cut.
Good cutting is what brings fire to the ice.