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Symmetry Features

Symmetry faults are irregularities in the cut caused during cutting.

 Determination of proportions includes the following measurable symmetry features:

Symmetry features are examined visually under 10 x magnification and jud­ged according to degree of discernibility. Thus:

Crown Deviation from circular shape
Tilted table
Eccentric table
Wavy table edges
Truncated main facets
Main- facets too short
Transposed facet edges
Facets of unequal size
Girdle Girdle with unequal thicknesses
Wavy girdle
Edge displacement at girdle
Pavilion Truncated main facets
Main facets too short
Girdle facets of unequal lengths
Facets of unequal size
Appearance of the culets

Table of Symmetry Features

Crown   Girdle  
Deviation from circular shape Deviation from circular shape Knife-edged Knife-edged
Tilted table Tilted table Thin girdle Thin
Eccentric table Eccentric table Medium Girdle Medium
Wavy table edges Wavy table edges Thick Girdle  Thick
Truncated main facet at girdle Truncated main facet at girdle Wavy Girdle  Wavy
Truncated main facet at table Truncated main facet at table Unequal widths  Unequal widths
Main facets too short Main facets too short Edge displacement: crown and pavilion  Edge displacement: crown and pavilion
Transposed facet edges Transposed facet edges Pavilion  
Facets of unequal size Facets of unequal size Eccentric culet  Eccentric culet
    Truncated main facet   Truncated main facet
    Main facet too short  Main facet too short
    Girdle facets of unequal lengths  Girdle facets of unequal lengths
    Facets of unequal size  Facets of unequal size
Table reflection to estimate pavilion depth Deviation from circular shape