Helium help : Comprehensive list of report parameters
Facets' slope and azimuth angles
for rounded fancies (obsolete)

Main facets

Applicable to rounded Fancies / Marquise, Oval, Pear

Main facets are divided into: "Crown mains facets", "Crown nock facets", "Crown other facets", "Pavilion mains facets", "Pavilion nock facets" and "Pavilion other facets" groups. See figure 1 and figure 2 below.

Slope angle parameters are measured for mains, nock and other groups of facets: crown mains angle, crown nock angle, crown other angle and pavilion other angle.

Star, upper and lower girdle facets

Applicable to:

  • Rounded Fancies (Marquise, Oval)

Star, upper and lower girdle facets are divided into: "Wing" and "Point" groups. See figure 1 and figure 2 below.

Slope and azimuth angles are measured for wing and point groups of facets: star point facets angle, star wing facets angle, star point facets azimuth, star wing facets azimuth and etc.

Figure 1.
Pavilion view of the Oval cut with indication of facet`s slope angles. Pavilion mains and pavilion nock facets are absent for this type of cutting.

Figure 2.
Crown view of the Oval cut with indication of facet`s slope angles.

DiamCalc Brilliant Cut Parameters