Tumblr user Pathetic Paripatetic has designed what might be the coolest diamond ring in all of time and space, based on the Doctor's TARDIS.

He writes:

It's a Police Box based ring with a tension set 1CT Princess Cut center stone. The three round stones is the Police Box sign, the two sets of four baguettes symbolize the windows, and a small princess cut below that to symbolize the instructions found on the front of the Police Box.

Now all that's left to do is go back in time to before the Ponds were engaged and slip this little beauty into Rory's pocket. The Doctor would certainly approve.

[themarysue]