File :1243241275.jpg-(226 KB, 1024x1536, Medieval_armor.jpg)
Dude, the guys and girls of /tg/ can't even figure out how to ask someone out on a date, and you want to know how we would PROPOSE?
Okay here's what you do...
Go out and find a guide on making medieval full plate armor, the internet should help with this. Get the equipment and tools necessary and begin hammering out and forging your new suit of armor. After several months of painstaking work, which your lady can even help you with, you will finally have a completed and expertly polished and shining knightly plate armor that perfectly fits you.
Ask her to meet you in a public park on a bright sunny day. Put on your suit of knightly armor and meet her there. When you get close, go down on one knee, bring out your ring and propose.
Bonus points if you ride up to her on a horse.