Creating a standard cut diamond in swft

Hey can anyone tell me how to make a standard diamond cut shape in swift.?
like the one attached

Create a lathe object and have it include a low amount of segments. It’s a bit hard to explain without pictures so I’ve attached a .t3d model in a zip file. It looks roughly like what you are after, but it is by no means like an accurately cut diamond. To do that you’d need a 3rd party 3D application where you are able to edit vertices.