Create a 3D ply file with faces and vertices from numpy array containing vertices

I have the following set of vertices and i would like to create a 3D ply file that have lines and vertices(it would be great to also have faces)

 vertices = 
[[ 2.304688  -1.882748  -2.1874995]
 [-3.007812   1.6       -2.1875005]
 [-3.007812  -1.882748  -2.1875005]
 [ 2.304688  -1.882748  -2.1874995]
 [ 2.304688   1.6       -2.1874995]
 [-3.007812   1.6       -2.1875005]
 [-3.007812  -1.882748  -2.1875005]
 [-3.007813   1.6        2.9687495]
 [-3.007813  -1.882748   2.9687495]
 [-3.007812  -1.882748  -2.1875005]
 [-3.007812   1.6       -2.1875005]
 [-3.007813   1.6        2.9687495]
 [-3.007813  -1.882748   2.9687495]
 [ 2.304687   1.6        2.9687505]
 [ 2.304687  -1.882748   2.9687505]
 [-3.007813  -1.882748   2.9687495]
 [-3.007813   1.6        2.9687495]
 [ 2.304687   1.6        2.9687505]
 [ 2.304687  -1.882748   2.9687505]
 [ 2.304688   1.6       -2.1874995]
 [ 2.304688  -1.882748  -2.1874995]
 [ 2.304687  -1.882748   2.9687505]
 [ 2.304687   1.6        2.9687505]
 [ 2.304688   1.6       -2.1874995]
 [ 2.304687   1.6        2.9687505]
 [-3.007813   1.6        2.9687495]
 [-3.007812   1.6       -2.1875005]
 [-3.007812   1.6       -2.1875005]
 [ 2.304688   1.6       -2.1874995]
 [ 2.304687   1.6        2.9687505]]

Right now I can create a a ply file containing the vertices using the following:

pcd = o3d.geometry.PointCloud()
pcd.points = o3d.utility.Vector3dVector(vertices)
o3d.visualization.draw_geometries([pcd])

When I display it in Open3D i can obviously only see the vertices. I would like to be able to see also the lines and the faces if it is possible.

How can I do that?