Once mined, rough diamonds are sorted into industrial diamonds or those of gem quality. Those of gem quality are classified into groups based on size, shape, quality and color. Every diamond has some unique feature so as no two diamonds are the same.

After sorting, the diamonds are cut and polished requiring great skill and experience. Belgium, China, India, Israel, Russia and the USA as well as other countries have centres for facilitating this. The more proficiently a stone is cut the more reflected light and brilliance will be seen. The diamond after this process is classified by its cut, color, clarity and carat weight, known famously as the "Four Cs."

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