What to consider when you're looking for an engagement ring: Size Finger size, that is. If you don’t know, see if you can snatch a ring she wears often. Just be careful – finger size on the right hand and left hand can be different. The dominant hand can be anywhere from a quarter to half a size bigger. You can also encourage a friend to take her shopping and casually mention that they should get measured for ring size, or there are also apps on your phone that can measure ring size pretty accurately. Sure, she might catch on, but you’ll be happy knowing you’re getting as close to accurate as possible. Don't know what to look for in an engagement ring? We've got a few tips in our link in bio!