The trillion: a three-sided brilliant whose sides bow outward across four girdle flats, rounder in the hand than the straight-sided trilliant.

A classic shape from the Brilliani Labs cut library, generated from the studio's own facet data. It is not scanned, and not traced from a third-party model. The solid is watertight and manifold, with one planar face per facet, so it prints, casts and renders without repair.

Geometry, measured from the delivered mesh:

• 73 planar facets, 142 triangles, 73 vertices
• 9.34 x 8.83 x 4.48 mm at the 2.00 ct reference size, L:W 1.057
• table 56.6% · crown 36.0° · pavilion 49.7° · depth 50.7%
• Millimetre units, real-world scale, origin at the centre of the girdle plane
• Closed shell, outward normals, no duplicate vertices

Five formats are included. STEP carries the true solid body for CAD, so the facets stay as planar faces you can select and fillet. 3DM opens in Rhino as a closed mesh on its own layer; reach for the STEP when you want the faceted solid. STL and OBJ are the watertight mesh for printing and rendering. GLB is a compact web and AR preview with the material embedded.

Scale it freely: carat weight follows the cube of size, so uniform scaling stays honest. For a physically plausible render, use a refractive index of 2.417 for diamond or 2.65 for moissanite.