Board Thread:General Discussion/@comment-15675979-20150505075608/@comment-26297377-20150505200855

They're not the same at all.

One is a polyhedron and is supposed to be a direct visual reference to the protein shell on a bacteriophage that protects its genetic matter. The other is a two-dimensional iris.

The link is tenuous at best. Gems technology, in general, just likes a lot of regimented geometry.