onto one of your fingers as far as possible, and mark where the ring fits. Take care not to push it too far. Otherwise, it may get stuck and you will have trouble getting it off. Be careful when you wash your hands; you don't want the mark to wash off. Go to a jeweler before the mark wears off and they will be able to measure her ring size with your finger. Get Help Enlist the help of your fiancee's friends or family. A close friend, sister or mother can find out your girlfriend's ring size without raising her suspicions. They can admire a ring that she's wearing and ask to try it on. You can either take that person with you while ring shopping, take one of her rings, or she can pass along the ring size of that finger. The only downside to this approach is that you have to let others in on your proposal. About the Author Yu Qing is a freelance writer and has worked in the bridal jewelry and event planning industries. Related Guides A token of love, a symbol of forever. Whether a plain metal band or an exquisite work of craftsmanship, the wedding ring has played a central role in marriage ceremonies throughout history.... Read More Planning Reminder: Something that sparkles Once upon a time, the groom surprised the bride with a ring he picked himself. The uber-romantic may still opt for this route. But ring-shopping can also be a joint