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Home > Cut > Symmetry Features > Eccentric culet

Eccentric culet

Fig 272 Eccentric culet The culet at the tip of the stone should lie in the centre beneath the table. Its displacement sideways is very quickly established on looking through the table. An eccentric culet is directly associated with inequality of the pavilion facet angles, for which reason eccentricity of the culet has an even more adverse effect on the symmetry than a displaced table (Fig 271 and 272). A culet displaced up to 2% is still accepted as "very good".

Cases also occur where the table and culet are either displaced in one and the same direction or in' opposite directions (Fig, 273).

Fig 273 a Eccentric culet and table Fig 273 b Eccentric culet and table
Fig 273 Eccentric culet and table

Some opinions hold that displacements of both units in the same direction cancel each other out and are therefore regarded as less serious than displacements in opposite directions; but, contrary to this, the author - as a result of critical observations of such symmetry faults carried out intentionally believes that there is nothing to choose between them; both features affect the symmetry if they exceed 2 % and their evaluation should be reflected in a lower cut-grade.

Tilted table / Eccentric table Symmetry of table and table edges