I think I've got a new idea for a marketing slogan that's really gonna help precious gem peddlers move product. This is just off the top of my head, mind you, but I think it's a good start:
Diamonds. Fuck practicality and good sense; buy a really expensive shiny rock to wear on your finger.
Or how about:
If you're poor and can't afford a diamond, you don't really love the women you want to marry.
Seriously though, can someone please explain to me how absurdly expensive rocks became synonymous with love and commitment? "I want to marry you and be with you forever, so I blew three months pay on this thing for your finger." It's just stupid and the fact that this idea has become so ingrained in our culture truly speaks to the extent to which vanity, greed, and gluttony have run amuck.