When you’re buying something as special as an engagement ring or wedding band, fit is important for a number of reasons. If the jewelry’s too small, it won’t sit right—or worse, it’ll mess with the health of your finger. If the piece is too big, it’ll slide off more easily, which puts you at risk of losing it. Ring Sizes matter—that much is clear. But how do you measure yours? We asked two experts to answer the commonly-asked question, and offer up some related tips. Use their advice to ensure that your Ring Sets Comfortably on your hand for years to come.