Whether your class ring is 1 year old or 50, it may not fit. Over time, your finger may get smaller. If the ring won't fit snugly, it may slip off and get lost. You can always have a jeweler make your ring smaller, but before doing that, try a do-it-yourself technique to make your ring fit properly.
Cut a piece of flesh-colored tape to create a quarter-inch square. You can find flesh-colored tape in your local department store. Flesh-colored bandages also work. If you choose the later, cut a section that does not include the padding.
Wrap the tape around the bottom of the ring, opposite the ring stone. When you hold the ring vertically, the stone will appear on top, and the tape on the bottom.
Place the ring on your finger. If it's too tight, remove the tape and try again with a smaller piece of tape. If the ring still fits loosely, proceed to the next step.
Cut another quarter-inch-sized section of tape. Wrap it around the previous tape and place the ring on your finger. Continue adding small sections of tape until the ring fits perfectly.
If the ring is too small, consult a jeweler to see if it can be re-sized.