Rant of the day

So... I saw a Valentines Day commercial involving rings... and I started thinking about every engagement ring ad that I have ever seen. I started realizing that every engagement ring ad contains rings with protruding jewels (usually diamonds) on them. Basically what happens next, is that the diamond spins to the other side of the hand, scratches the neighboring fingers, and snags clothing, usually only the expensive clothing. Are engagement rings supposed to be that annoying? Do they HAVE to have a diamond? When someone gives an engagement ring with a protruding diamond, aren't they really saying "With this instrument of torture, I promise to be a thorn in your side for the rest of your life?" Is it actually proper etiquette to give a ring with a protruding jewel? What kind of sadist came up with that tradition? What would be the social consequences to breaking with that tradition? Then the ad was over and I forgot about it for a while but the questions remain unanswered.