Doctor Who's magical, time-traveling police box is pervasive enough in pop culture to have inspired not just one, but two thousand-dollar-plus unique and artisan-crafted diamond rings. Probably more, really, but this is the second one I'm hauling out to the dog & pony show (here's the first).
Drew Rummell of Dtek Designs hopes you'll find his TARDIS ladies' wedding ring the most stellar in the Whoniverse. He makes them using natural SI quality diamonds, G-H color, and natural blue sapphires. The ring has a 1/4 carat total weight, and is made to order in a sterling silver, white, rose, or yellow gold, or platinum band.