The art of polishing a diamond is to maximize its brilliance and fire (dispersion).
A diamond that is cut too deep or too shallow will be less brilliant and ultimately, less valuable.
The cut is the only factor of a polished diamond’s value that is controlled by human hands.
The smallest variation in colour makes a difference. Colourless diamonds are the
most admired, but diamonds are found in all colours of the rainbow. The rarer the colour,
the more valuable is the diamond.
Most diamonds contain inclusions, which developed during their formation in
the earth. The number, type, size, position and brightness of these inclusions can affect
the clarity of a diamond.