You would surely want to keep an $8,000 diamond engagement ring away from thieves. Most likely, you would keep it in a safe. Conventional safes have combination locks, but it is fairly easy to locate them. If the burglar who breaks into your home happens to be a safecracker, you might as well have left your engagement ring on top of your dresser.
Store the ring in a Love My Carpet Deodorizer Diversion Safe instead. It looks just like a can of carpet deodorizer, but can hide valuables through stealthily detachable lids. Any robber will just walk past it.