The various parts of a diamond are illustrated to the right and below.
The typical faceting style and facet names for the Round Brilliant Cut are illustrated here. Counting the culet, which is not always actually polished as a facet, the 
Round Brilliant has 58 facets. Their exact placement relative to one another, as well as the proper angles of their placement, plays a critical role in the appearance of the finished stone.
Any diamond which is not "poorly cut" will reflect some of the light which enters it and disperse some of it, which gives diamonds their unique brilliance and dispersion. The primary reason for grinding and polishing facets on a diamond is to enable the light to enter the stone and reflect back to the viewer in a positive way, thus making the given stone "marketable". Unfortunately, economics plays a role in the decision making which directs the size and placement of the facets as well as the ultimate size and shape of the finished stone.
Round Brilliant has 58 facets. Their exact placement relative to one another, as well as the proper angles of their placement, plays a critical role in the appearance of the finished stone.Any diamond which is not "poorly cut" will reflect some of the light which enters it and disperse some of it, which gives diamonds their unique brilliance and dispersion. The primary reason for grinding and polishing facets on a diamond is to enable the light to enter the stone and reflect back to the viewer in a positive way, thus making the given stone "marketable". Unfortunately, economics plays a role in the decision making which directs the size and placement of the facets as well as the ultimate size and shape of the finished stone.
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