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Parts of a Diamond

A finished diamond's proportions affect its ight performance, which in turn affects its beauty and overall appeal. If light enters through the crown of a poorly proportioned diamond, it might exit through the pavilion, making the diamond look dark and unattractive. Diamonds with good proportions, symmetry, and polish make better use of light, and will be bright, fiery, and sparkling.

The elements of diamond proportions are:

Girdle outline
Table size (table percentage)
Crown angle
Girdle thickness
Pavilion depth percentage (pavilion angle)
Total depth percentage
Culet size
Length-to-width ratio (fancy shapes)

parts of a diamond

A diamond's light performance is governed by the symmetry of its facets and planes. Some proportion combinations make light perform better than others.