This may be a point of contention, but if it came down to receiving a diamond ring from your lover or forgoing coffee for the rest of your life, most ladies would be at a stalemate. With this, you can please your girl in more ways than one.

The 2-carat ring mug has a ring handle (either "gold" or "platinum") with a Swarovski crystal embedded in it. When you present her with this, make sure you show it to her in the box to get her excited. Sure, she may slap you, but she will also enjoy the coffee and the thought that you might actually propose in the near future. 

Thanks to Brittany for the tip!

[$16, The Spoon Sisters]