Ideal cut diamond (with the right proportions). A Round Brilliant diamond is cut with 58 flat faces total. The size, placement, and symmetry of the facets impact how well the diamond refracts and reflects light.
Modeled in Blender 2.93. Scale 1 m. Cycles don't support dispersion so I rendered in Arnold. Diamond IOR : 2.418
Variants of the model:
Subdivision level 0. Polygons: 2 228 Vertices: 2 230
Subdivision level 2. Polygons: 35 648 Vertices: 35 650