White diskRed reflectorLens port, or no light back

Symmetry is the share of the pattern where all sixteen halves match. The proportions shape the arrows and hearts; symmetry decides whether all eight are alike.

Traced from the stone's geometry, the same way for every gemstone: 2.5° lens port, white disk to 13.5°, red reflector to 90°.

Cut

Gemstone

Proportions

Pavilion angle40.75°

Crown angle34.5°

Table size53.0%

Corner to corner, as a share of the diameter.

Symmetry

Crown twist0.0°

The crown turned against the pavilion.

Main angles±0.00°

Each main up to this much steeper or shallower.

Main spacing±0.0°

Each main up to this much off its even spacing.

Culet off-centre0.0%

The culet off the axis, as a share of the diameter.

A simulation of the stone's geometry, not a grading report.

The stone through the scope