Because he doesn't really love you unless he gives you an ALL-DIAMOND RING, like this one from Shawish Jewelers of Geneva, Switzerland.
A Transformers engagement ring! Autobots assemble! We gotta get a convoy going to this wedding in case the Decepticons show up.
Melissa says: "Even the sonic screwdriver couldn't make my ring more gorgeous! My photographer Heidi Caldwell was awesome in incorporating our Star Wars and Doctor Who themed wedding." It's just a good thing they aren't made of wood!