Pavilion Angle
The angle measured between the girdle and the pavilion main facet.
Pavilion Main Facets ...
Pavilion Angle
The Pavilion Angle is the Angle or Slope of the base of the Diamond from the Girdle to the Culet.
Pavilion Depth ...
Pavilion Angle The angle between the main pavilion facets and the girdle. In diamond cutting and proportion, this is the single most important dimension, and should be around 40.75° to 41°.
pavilion angle
The angle at which the main facets of a diamond's pavilion instersect with the plane of its girdle
point
One hundredth of a carat, or 0.002 grams ...
pavilion angle The optimum pavilion angle is 40.75 degrees which is measured off of the girdle plane (or the table which is parallel). The eight main facets (elongated kite shapes) are where the measured pavilion angles would occur.
Therefore, it is not possible to determine the individual contributions of the crown, girdle and pavilion to the total depth and no crown or pavilion angles are given.
Brilliancy: a gemstone needs to be cut with correct crown and pavilion angles for light to be reflected back up through the crown and appear bright. Shallow and deep stones will leak light through the pavilion causing loss of brilliance.
1) The shallower the pavilion angles, the greater the yield (but the less the brilliance).
2) Included rough can be oriented (with loss of yield) to eliminate or minimize the appearance of inclusions. ...
Due to the position of the culet, the cutter is able, in the case of step cuts, to influence the pavilion angle, as the longer the culet, the wider is the pavilion angle.
This difficulty is because Cut is a combination of a number of aspects including crown depth, crown angle, pavilion depth, pavilion angle, symmetrical arrangement of facets, polish amongst others; a perfect balance is difficult to determine.
Window: an area in a transparent gemstone where the body color appears to be see-through or
watery. This occurs when the
crown or pavilion angles are cut shallowly, causing light to leak out of the pavilion.
Describes the cutting quality relative to the Table Percentage, Depth Percentage, Girdle Percentage, Crown and Pavilion angles and symmetry.
Radiant Cut ...
The AGSL grades a diamond's symmetry and proportions according to where facets intersect, and crown/pavilion angles, but does not measure or quantify relative facet angles and/or individual facet ratios.
An Ideal cut has a specific set of guidelines defining the proportions that give a diamond the highest level of fire and brilliance. It takes into account the relationship between the table size, crown angle, pavilion angle, girdle, ...
The bezel angle is 34° 30' and the pavilion angle is 40° 45'. Girdle thickness as a percentage of the girdle's diameter varies with size. The larger the stone, the smaller the percentage for a medium girdle. The variation is from about 1% to 3%.
Respective of the girdle diameter, the crown height is 14.4%, the pavilion depth is 43.2%, the table diameter is 56.0%, and the crown height to pavilion depth ratio is 1: 3.00. The crown angle is 33.2 degree and the pavilion angle is 40.8 degrees.
ring size Inclusion Indented Natural Insurance Laser Inscription Length to Width Ratio Lifetime Trade-In Guarantee Loose Diamond Packaging Lumera Appraisal Marquise cut Measurements Mohs Scale Natural Needle Oval cut Pavilion Pavilion Angle ...
These formulas are calculated for well proportioned stones; add 2% to 6% for bulge factor, i.e., excessively steep crown or pavilion angles.
Just a few degrees off the standard can have a drastic impact on a stone's brilliance. But there is some leeway. Cutters can compensate by adjusting crown angles, table sizes and pavilion angles to produce the best possible results for each stone.
 See also: Facet, Cut, Pavilion, Proportion, Crown
  
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