Sometimes expensive items may accidentally be washed down the sink or the bathroom drain. If you take the precaution to turn off the faucet to prevent water from going down the sink then you can easily retrieve the fallen item. Usually they will be caught in the P-trap hence can be retrieved easily but if more water flows it will flush the item into the main sewer tank which is difficult to retrieve and will require the help of an expert. For instance if you have accidentally dropped a earring then you can retrieve it easily by opening the P-trap. The P-trap is installed mainly to prevent the sewer gas to flow out through the sink. Since it looks like a P shape it is called a P-trap. The first step is to place a bucket below the J bend or the P-trap of the kitchen or bathroom sink. Once you place the bucket loosen the nuts near the bend. You need to unscrew the slip nut completely from both the sides of the J bend.
Once you open the P-trap the collected water will start flowing out into the bucket. Check the bucket for the earring. If it is inside the P-Trap then it will be inside the bucket. If it is not inside the bucket then check the bend as it may be stuck inside the bend. If the earring is not found inside the P-trap or the bucket after opening then it means that it has gone further down and might have even reached the sewer tank. In such a situation you will have to call a plumber to help you retrieve the item.