i once saw this river phoenix movie where he proposed to a girl with a plastic ring that you get on one of those 20c machines that you put a cion in and turn the knob.
tell her the ring is plastic because your love can not be measuerd in gold.
if you dont look like river phoenix, you migth try paying your local chinese restaurant $100 to put a ring in a fortune cookie and make sure she gets the cookie.
the night before the wedding get your lawyer to pay her a visit and sign the pre-nup. experience has shown that women are reluctant to lose face 12 hours before their weddign over a piece of paper.
say you are doing it to protect the kids from evil lawyers.
to ensure a marriage lasts. go for the most extreme version of christianity available. or even consider extremist islam or hinduism, where divorce initiated my the woman is extremely unlikely, and poteantially a fatal mistake.
the gold coin story is a bit unbelievable. i would not go with that. buy shares with the money you save. good luck