Inner Message Ring
It's the relationship and commitment hairshirt! Currently available in "Always" and "Marry me", Inner Message Rings are the perfect way to say, "If you really love me, you'll wear this ring that never stops gouging your flesh, and then leaves a deep imprint when you take it off." So much potential too. Maybe in time they'll be customizable, so you can personalize one with your name--or words that incur slightly less dread--and start the next "Carrie" necklace rage.