There's an app for that. A Tiffany's app no less! And since it is the most luxurious place to shop for jewelry, it was only a matter of time they went mobile as well. The Tiffany & Co. Engagement Ring Finder, the jeweler's first iPhone app- even features a ring sizer, where you can place an actual ring directly on the screen and align it with the correct circle in the guide. (click here for video!)
It also educates you on all the different types of styles and diamonds they have, which is key when everyone asks about the ring once the happy engagement news goes viral. Plus you can even match a wedding band with it!
You can share your dream ring via email, facebook or twitter. My suggestion? Download it on your man's iPhone when he's in the shower. How'd that get on there?! tehehehe
Also, cook him up my infamous 'Forget Engagement Chicken' dinner. You are golden after that.