Cut is how a gem-cutter s skill is determined. There are 57 or 58 angled planes called facets in a good cut that release the brilliant colors of a diamond. If it s not cut just right, a diamond can lose light through the bottom. Diamonds are cut in many countries, but the major cutting centers are in New York, Antwerp, Tel Aviv and Bombay. Jewelers will tell you that color is the hardest quality to judge.
Most diamonds look white.
However, with the right cut, tints of color from pink to light yellow appear. Color-graded stones with the label D, E or F are more expensive and much more rare. Clarity is determined by nature. Over millions of years, the diamond formed to the level that it is and jewelers judge it s clarity on scale from flawless to those with prominent imperfections. A flawless diamond will have only miniscule traces of non-crystallized carbon.