Every woman in love dreams of getting an engagement ring, but not too many put much thought into maintaining it. And you should! Your diamond should be checked once a year to make sure it’s not loose in its setting. As for keeping your diamond shiny, I learned this trick from Martha: Soak your ring in a mixture of 1/2 cold water and 1/2 household ammonia for 30 minutes. Drain on a paper towel, and voila! Your diamond is as good as new.