What is it?

Tool included in 3D Artisans for Grasshopper, which allows creating brilliant cuts of rounded, oval, pear, marquise or cushion profiles, with the particularity that it not only generates from mathematically ideal girdle profiles but also from irregular profiles: deformed rounded, bowtie oval, elongated pear, asymmetric marquise, etc.

Brilliant Cut is especially useful for CAD reproduction of real gems, which is gems whose fillet profile does not obey ideal mathematical patterns such as the circumference (round brilliant) or the ellipse (brilliant oval), but the particular girdle profile with which the gem has been cut. Unlike the tools available in the most popular jewelry plugins, the Brilliant Cut tool by 3D Artisans allows you to reproduce real gems in CAD. The need and development of this tool is the result of the limitations found in commercial jewelry plugins, which only allow cuts to be created from ideal mathematical profiles.

Here is a sample of the capabilities of the tool. In the first row, sizes with an ideal profile have been created. In this case, the Brilliant Cut provides the same results as commercial plugins. In the second row gems have been created with slight deformations with respect to the ideal profile, that is to say, just like real gems. Commercial jewelry plugins do not generate these types of cuts. Less common gems with extreme deformations have been created in the third row to explore the tool's potential.



How is it used?

First, a previously created curve corresponding to the girdle section must be selected. By default, a gem will be created with the standard parameters of table size, crown height, pavilion height, girdle height, culet size and position. The gem is obtained in two formats, polysurface, and mesh. The previous parameters can be modified by setting the Ideal parameter to False and entering the new values ​​in the corresponding input. It also allows determining if the fillet is faceted or not.


  • Girdle shape: Curve corresponding to the girdle section of the gem.
  • Ideal: If TRUE, it sets the standard parameters. If FALSE, it takes the parameters indicated in the following Inputs.
  • Table size: the shortest dimension of the table in absolute values.
  • Crown height: height of the crown from the girdle in absolute values.
  • Pavilion height: height of the pavilion from the girdle in absolute values.
  • Girdle height: girdle height in absolute values.
  • Girdle faces: If TRUE, the girdle facets appear.
  • Culet size: determines the shortest dimension of the culet in absolute values.
  • X move culet: movement of the culet on the abscissa axis.
  • Y move culet: movement of the culet in the ordinate axis.


  • Brep: gem cut in Poysurface format.
  • Mesh: gem cut in Mesh format.
  • Girdle shape: Curve of the girdle section at the new location.

Downloads for users with knowledge of parametric CAD

If you want to create parametric design projects with this tool, download 3D Artisans for Grasshopper here.


Downloads for users with no knowledge of parametric CAD

Brillant Cut and other 3D Artisans tools can be freely incorporated into Rhino 7. Download 3D Artisans for Rhino standard users here.