Enter the diamond ring and diamond syndicate De Beers. Huge, expensive diamond rings offered women an expensive symbol that the man wasn't just proposing marriage to get his willy wet. The more expensive the ring, the more your gal's virginity was worth. Which worked out pretty well for De Beers, which went balls-out manipulating the shit out of public opinion:
"We are dealing with a problem in mass psychology. We seek to ... strengthen the tradition of the diamond engagement ring -- to make it a psychological necessity capable of competing successfully at the retail level with utility goods and services ..."
We're not ad men, but we're pretty sure this translates to: "Nothing in your marriage has substance but these diamonds."
By the time De Beers was done, actresses were persuaded to wear rings in public, lecturers talked to high school girls about the importance of an expensive ring, and Japanese women abandoned ancient marriage ceremonies in favor of getting their diamond on. All of which was horrifying once we found out that a nice chunk of the labor force mining those diamonds were child slaves. And a larger chunk of diamond industry profit was supporting machete-wielding warlords.
So yeah, in conclusion, buy some sapphires. Or wedding guns. Nothing holds value like a nice gun.
Just try and fight off post-apocalyptic commie bike gangsters with some shiny stones.
But this is hardly the first time in human history that romantic love and warfare have been horribly, horribly linked. Just ask ...