Remember Ring gets warmer as you get closer to your anniversary.

This concept product that may soon be sold works like this: 24 hours before the date you set the interior surface of the ring will warm to 120º F for approximately 10 seconds, and continue to warm up every hour, on the hour, all day.

I love this quote:

I got two of 'em." says Jon Harshmen, "Well, I got one actually-my wife got me the other one." Holding up his hands to show both rings he says, "Anniversary and Birthday, baby. It's like a hand gun. Better to have it and not need it, than need it and not have it."

http://tecnochica.com/2006/09/burning-reminder-ring-para-que-nunca-mas-olvides-tu-aniversario/